History of paper
Paper is thin nonwoven material traditionally made from a combination of milled plant and textile fibres. The first paper-like plant-based writing sheet was papyrus in Egypt (4th Century BC), but the first true paper, the first true papermaking process was documented in China during the Eastern Han period (25–220 CE), traditionally attributed to the court official Cai Lun. This plant-puree conglomerate produced by pulp mills and paper mills was used for writing, drawing, and money. During the 8th century, Chinese papermaking spread to the Islamic world, replacing papyrus. By the 11th century, papermaking was  brought to Europe, where it replaced animal-skin-based parchment and wood panels. By the 13th century, papermaking was refined with paper mills using waterwheels in Spain. Later improvements to the papermaking process came in 19th century Europe with the invention of wood-based papers. Although there were precursors such as papyrus in the Mediterranean world and amate in the pre-Columbian Americas, these are not considered true paper. Nor is true parchment considered paper: used principally for writing, parchment is heavily prepared animal skin that predates paper and possibly papyrus. In the 20th century with the advent of plastic  manufacture, some plastic "paper" was introduced, as well as paper-plastic laminates, paper-metal laminates, and papers infused or coated with different substances to produce special properties. Precursors. Papyrus. The word "paper" is etymologically derived from "papyrus", Ancient Greek for the "Cyperus papyrus" plant. Papyrus is a thick, paper-like material produced from the pith of the "Cyperus papyrus" plant which was used in ancient Egypt and other Mediterranean societies for writing long before paper was used in China. Papyrus is prepared by cutting off thin ribbon-like strips of the interior of the "Cyperus papyrus", and then laying out  the strips side-by-side to make a sheet. A second layer is then placed on top, with the strips running at right angle to the first. The two layers are then pounded together into a sheet. The result is very strong, but has an uneven surface, especially at the edges of the strips. When used in scrolls, repeated rolling and unrolling causes the strips to come apart again, typically along vertical lines. This effect can be seen in many ancient papyrus documents. Paper contrasts with papyrus in that the plant material is broken down through maceration or disintegration before  the paper is pressed. This produces a much more even surface, and no natural weak direction in the material which falls apart over time. Paper in China. Archaeological evidence of papermaking predates the traditional attribution given to Cai Lun, an imperial eunuch official of the Han dynasty (202 BCE – 220 CE), thus the exact date or inventor of paper cannot be deduced. The earliest extant paper fragment was unearthed at Fangmatan in Gansu province, and was likely part of a map, dated to 179–141 BCE. Fragments of paper have also been found at Dunhuang dated to 65 BCE and  at Yumen pass, dated to 8 BCE. The invention traditionally attributed to Cai Lun, recorded hundreds of years after it took place, is dated to 105 CE. The innovation is a type of paper made of mulberry and other bast fibres along with fishing nets, old rags, and hemp waste which reduced the cost of paper production, which prior to this, and later, in the West, depended solely on rags. Techniques. During the Shang (1600–1050 BCE) and Zhou (1050–256 BCE) dynasties of ancient China, documents were ordinarily written on bone or bamboo (on tablets or on bamboo strips sewn and  rolled together into scrolls), making them very heavy, awkward, and hard to transport. The light material of silk was sometimes used as a recording medium, but was normally too expensive to consider. The Han dynasty Chinese court official Cai Lun (c. 50–121 CE) is credited as the inventor of a method of papermaking (inspired by wasps and bees) using rags and other plant fibers in 105 CE. However, the discovery of specimens bearing written Chinese characters in 2006 at Fangmatan in north-east China's Gansu Province suggests that paper was in use by the ancient Chinese military more than  100 years before Cai, in 8 BCE, and possibly much earlier as the map fragment found at the Fangmatan tomb site dates from the early 2nd century BCE. It therefore would appear that "Cai Lun's contribution was to improve this skill systematically and scientifically, fix a recipe for papermaking". Cai Lun's biography in the "Twenty-Four Histories" says: The production process may have originated from the practice of pounding and stirring rags in water, after which the matted fibres were collected on a mat. The bark of paper mulberry was particularly valued and high quality paper was developed  in the late Han period using the bark of "tán" (檀; sandalwood). Although bark paper emerged during the Han dynasty, the predominant material used for paper was hemp until the Tang dynasty when rattan and mulberry bark paper gradually prevailed. After the Tang dynasty, rattan paper declined because it required specific growing areas, was slow in growth, and had a long regeneration cycle. The most prestigious kind of bark paper was known as Chengxintang Paper, which emerged during the Five Dynasties and Ten Kingdoms period, and was only used for imperial purposes. Ouyang Xiu described it as shiny, elaborate, smooth , and elastic. In the Eastern Jin period a fine bamboo screen-mould treated with insecticidal dye for permanence was used in papermaking. After printing was popularized during the Song dynasty the demand for paper grew substantially. The supply of bark could not keep up with the demand for paper, resulting in the invention of new kinds of paper using bamboo during the Song dynasty. In the year 1101, 1.5 million sheets of paper were sent to the capital. Uses. Among the earliest known uses of paper was padding and wrapping delicate bronze mirrors according to archaeological evidence dating to the  reign of Emperor Wu of Han from the 2nd century BCE. Padding doubled as both protection for the object as well as the user in cases where poisonous "medicine" were involved, as mentioned in the official history of the period. Although paper was used for writing by the 3rd century CE, paper continued to be used for wrapping (and other) purposes. Toilet paper was used in China from around the late 6th century. In 589, the Chinese scholar-official Yan Zhitui (531–591) wrote: "Paper on which there are quotations or commentaries from Five Classics or the names of sages, I  dare not use for toilet purposes". An Arab traveler who visited China wrote of the curious Chinese tradition of toilet paper in 851, writing: "... [the Chinese] do not wash themselves with water when they have done their necessities; but they only wipe themselves with paper". During the Tang dynasty (618–907) paper was folded and sewn into square bags to preserve the flavor of tea. In the same period, it was written that tea was served from baskets with multi-colored paper cups and paper napkins of different size and shape. During the Song dynasty (960–1279) the government produced the world 's first known paper-printed money, or banknote ("see Jiaozi and Huizi"). Paper money was bestowed as gifts to government officials in special paper envelopes. During the Yuan dynasty (1271–1368), the first well-documented European in Medieval China, the Venetian merchant Marco Polo remarked how the Chinese burned paper effigies shaped as male and female servants, camels, horses, suits of clothing and armor while cremating the dead during funerary rites. Impact of paper. According to Timothy Hugh Barrett, paper played a pivotal role in early Chinese written culture, and a "strong reading culture seems to have developed quickly after its  introduction, despite political fragmentation." Indeed, the introduction of paper had immense consequences for the book world. It meant books would no longer have to be circulated in small sections or bundles, but in their entirety. Books could now be carried by hand rather than transported by cart. As a result, individual collections of literary works increased in the following centuries. Textual culture seems to have been more developed in the south by the early 5th century, with individuals owning collections of several thousand scrolls. In the north an entire palace collection might have been only a few thousand scrolls in  total. By the early 6th century, scholars in both the north and south were capable of citing upwards of 400 sources in commentaries on older works. A small compilation text from the 7th century included citations to over 1,400 works. The personal nature of texts was remarked upon by a late 6th century imperial librarian. According to him, the possession of and familiarity with a few hundred scrolls was what it took to be socially accepted as an educated man. According to Endymion Wilkinson, one consequence of the rise of paper in China was that "it rapidly began to surpass  the Mediterranean empires in book production." During the Tang dynasty, China became the world leader in book production. In addition the gradual spread of woodblock printing from the late Tang and Song further boosted their lead ahead of the rest of the world. However, despite the initial advantage afforded to China by the paper medium, by the 9th century its spread and development in the Middle East had closed the gap between the two regions. Between the 9th to early 12th centuries, libraries in Cairo, Baghdad, and Cordoba held collections larger than even the ones in China, and dwarfed those  in Europe. From about 1500 the maturation of paper making and printing in Southern Europe also had an effect in closing the gap with the Chinese. The Venetian Domenico Grimani's collection numbered 15,000 volumes by the time of his death in 1523. After 1600, European collections completely overtook those in China. The Bibliotheca Augusta numbered 60,000 volumes in 1649 and surged to 120,000 in 1666. In the 1720s the Bibliothèque du Roi numbered 80,000 books and the Cambridge University 40,000 in 1715. After 1700, libraries in North America also began to overtake those of China, and toward the end  of the century, Thomas Jefferson's private collection numbered 4,889 titles in 6,487 volumes. The European advantage only increased further into the 19th century as national collections in Europe and America exceeded a million volumes while a few private collections, such as that of Lord Acton, reached 70,000. Paper became central to the three arts of China – poetry, painting, and calligraphy. In later times paper constituted one of the 'Four Treasures of the Scholar's Studio,' alongside the brush, the ink, and the inkstone. Paper in Asia. After its origin in central China, the production and use of paper spread  steadily. It is clear that paper was used at Dunhuang by 150 CE, in Loulan in the modern-day province of Xinjiang by 200, and in Turpan by 399. Paper was concurrently introduced in Japan sometime between the years 280 and 610. Eastern Asia. Paper spread to Vietnam in the 3rd century, to Korea in the 4th century, and to Japan in the 5th century. The paper of Korea was famed for being glossy white and was especially prized for painting and calligraphy. It was among the items commonly sent to China as tribute. The Koreans spread paper to Japan  possibly as early as the 5th century but the Buddhist monk Damjing's trip to Japan in 610 is often cited as the official beginning of papermaking there. Islamic world. Origin. Paper was used in Central Asia by the 8th century but its origin is not clear. According to the 11th century Persian historian, Al-Thaʽālibī, Chinese prisoners captured at the Battle of Talas in 751 introduced paper manufacturing to Samarkand. However there are no contemporary Arab sources for this battle. A Chinese prisoner, Du Huan, who later returned to China reported weavers, painters, goldsmiths, and silversmiths among the prisoners  taken, but no papermakers. According to Al-Nadim, a writer in Baghdad during the 10th century, Chinese craftsmen made paper in Khorasan: According to Jonathan Bloom – a scholar of Islamic and Asian Art with a focus on paper and printing, the connection between Chinese prisoners and the introduction of paper in Central Asia is "unlikely to be factual". Archaeological evidence shows that paper was already known and used in Samarkand decades before 751 CE. Seventy-six texts in Sogdian, Arabic, and Chinese have also been found near Panjakent, likely predating the Muslim conquest of Transoxiana. Bloom argues that based on  differences in Chinese and Central Asian papermaking techniques and materials, the story of Chinese papermakers directly introducing paper to Central Asia is probably metaphorical. Chinese paper was mostly made of bast fibers while Islamic paper was primarily made of waste material like rags. The paper-making innovations in Central Asia may be pre-Islamic, probably aided by the Buddhist merchants and monks of China and Central Asia. The Islamic civilization helped spread paper and paper-making into the Middle East after the 8th-century, from where it arrived into Europe centuries later, and then to many other parts of the  world. A historical remnant of this legacy is the continued use of the word "ream" to count bundles of paper, a word derived from Arabic "rizma" (bundle, bale). Shift from parchment to paper. During the 8th century, paper started to replace parchment as the primary writing material for administrative uses in Baghdad, the capital of Abbasids. According to Ibn Khaldun, a renowned Muslim historiographer, parchment was rare, and a great increase in the number of correspondents throughout Islamic territories, resulted in an order issued by Al-Fadl ibn Yahya, the Abbasid’s Grand Vizier, for the manufacture of paper to  replace parchment. There are records of paper being made at Gilgit in Pakistan by the sixth century, in Samarkand by 751, in Baghdad by 793, in Egypt by 900, and in Fes, Morocco around 1100, in Syria e.g. Damascus, and Aleppo, in Andalusia around 12th century, in Persia e.g. Maragheh by 13th century, Isfahan by 14th century, Ghazvin and Kerman, in India e.g. Dowlat Abad by the 16th century. A Persian geography book written by an unknown author in the 10th century, Hodud al-Alam, is the oldest known manuscripts mentioning papermaking industry in Samarkand. The writer stated that the  city was famous for paper manufacturing and the product was exported to many other cities as a high-quality item. Samarkand kept its reputation for papermaking over few centuries even once the industry spread across other Islamic areas. For instance, it is said that some Ministers in Egypt preferred ordering their required paper to Samarkand from which the paper was transported all the way to Egypt. In Baghdad, particular neighborhoods were allocated to paper manufacturing and in Bazaar paper merchants and sellers owned distinct sectors being called Paper Market or "Suq al-Warraqin", a street which was lined with more  than 100 paper and booksellers' shops. In 1035 a Persian traveler, Nasir Khusraw, visiting markets in Cairo noted that vegetables, spices and hardware were wrapped in paper for the customers after they were sold. In the 12th century in a street was named "Kutubiyyin" or book sellers in Morocco which contained more than 100 bookshops. The expansion of public and private libraries and illustrated books within Islamic lands was one of the notable outcomes of a drastic increase in the availability of paper. However, paper was still considered a valuable good given the remarkable required input e.g. primary materials and  labourers to produce the item in the absence of advanced mechanical machinery. In one case Ibn al-Bawwab, a Persian calligrapher and illuminator, had been promised by the Sultan to be given precious garments in response to his services. Once the Sultan deferred delivering the promised clothes, he instead proposed the option of taking the papers stored in the Sultan’s library as his present. In another example, the hospitality of a Minister in Baghdad, Ibn Al-Forat, had been described by his generosity in freely handing out papers to his guests or visitors. Types of paper. A wide range  of paper types with different properties and place of origins were manufactured and utilised in Islamic lands. Paper varieties were named based on several criteria: Paper primary materials. Bast (hemp and flax), cotton, and old rags and ropes were the major input materials for producing the pulp. Sometimes a mixture of materials was also used for pulp making, such as cotton and hemp, or flax and hemp. Other uncommon primary materials such as fig tree bark are also reported in some manuscripts. Papermaking process. Very few sources have mentioned the methods, phases and applied tools in the papermaking process though . A painting from an illustrated book in Persian has depicted different stages and required tools of the traditional workflow. The painting has distinguished two major phases of the papermaking process: A manuscript from the 13th century has also elaborated the process of papermaking. This text shows how papermakers were undertaking multiple steps to produce high-quality paper. This papermaking instruction or recipe is a chapter under the title of "al-kâghad al-baladî" (local paper) from the manuscript of "al-Mukhtara'fî funûn min al-ṣunan" attributed to "al-Malik al-Muẓaffar", a Yemeni ruler of Rasulids. The bark of fig  trees, as the main source of papermaking in this recipe, went through frequent cycles of soaking, beating and drying. The process was taking 12 days to produced 100 sheets of high-quality paper. During the pulping stage, the beaten fibres were transformed into different sizes of "Kubba" (cubes) which they were used as standard scales to manufacture a certain number of sheets. The dimensions were determined based on three citrus fruit: limun (lemon), utrunja (orange) and narenja (Tangerine). A summarized version of this detailed process is as below. Each individual phase was repeated several times. Paper properties. Near Eastern paper  is mainly characterized by sizing with a variety of starches such as rice, katira, wheat and white sorghum. Rice and white sorghum were more widely used. Paper usually was placed on a hard surface and a smooth device called a "mohreh" was used to rub the starch against the paper until it becomes perfectly shiny. The laborious process of papermaking was refined and machinery was designed for bulk manufacturing of paper. Production began in Baghdad, where a method was invented to make a thicker sheet of paper, which helped transform papermaking from an art into a major industry. The use  of water-powered pulp mills for preparing the pulp material used in papermaking dates back to Samarkand in the 8th century. The use of human/animal-powered paper mills has also been identified in Abbasid-era Baghdad during 794–795, though this should not be confused with later water-powered paper mills (see "Paper mills" section below). The Muslims also introduced the use of trip hammers (human- or animal-powered) in the production of paper, replacing the traditional Chinese mortar and pestle method. In turn, the trip hammer method was later employed by the Chinese. Historically, trip hammers were often powered  by a water wheel, and are known to have been used in China as long ago as 40 BCE or maybe even as far back as the Zhou Dynasty (1050 BCE–221 BCE), though the trip hammer is not known to have been used in Chinese papermaking until after its use in Muslim papermaking. By the 9th century, Muslims were using paper regularly, although for important works like copies of the revered Qur'an, vellum was still preferred. Advances in book production and bookbinding were introduced. In Muslim countries they made books lighter—sewn with silk and bound with leather-covered paste  boards; they had a flap that wrapped the book up when not in use. As paper was less reactive to humidity, the heavy boards were not needed. Since the First Crusade in 1096, paper manufacturing in Damascus had been interrupted by wars, but its production continued in two other centres. Egypt continued with the thicker paper, while Iran became the center of the thinner papers. Papermaking was diffused across the Islamic world, from where it was diffused further west into Europe. Paper manufacture was introduced to India in the 13th century by Arab merchants, where it almost wholly replaced traditional  writing materials. Indian subcontinent. The evidence of paper use on the Indian subcontinent appears first in the second half of the 7th century. Its use is mentioned by 7th– and 8th-century Chinese Buddhist pilgrim memoirs as well as some Indian Buddhists, as "Kakali" and "Śaya" – likely Indian transliteration of Chinese "Zhǐ" (tsie). Yijing wrote about the practice of priests and laypeople in India printing Buddha image on silk or paper, and worshipping these images. Elsewhere in his memoir, I-Ching wrote that Indians use paper to make hats, to reinforce their umbrellas and for sanitation. Xuangzang mentions carrying 520  manuscripts from India back to China in 644 CE, but it is unclear if any of these were on paper. Thin sheets of birch bark and specially treated palm-leaves remained the preferred writing surface for literary works through late medieval period in most of India. The earliest Sanskrit paper manuscript found is a paper copy of the "Shatapatha Brahmana" in Kashmir, dated to 1089, while the earliest Sanskrit paper manuscripts in Gujarat are dated between 1180 and 1224. Some of oldest surviving paper manuscripts have been found in Jain temples of Gujarat and Rajasthan, and paper use by Jain  scribes is traceable to around 12th-century. According to the historical trade-related archives such as Cairo Geniza found in the synagogues of the Middle East, Jewish merchants – such as Ben Yiju originally from Tunisia who moved to India – imported large quantities of paper into ports of Gujarat, Malabar coast and other parts of India by the 11th-century to partly offset the goods they exported from India. According to Irfan Habib, it is reasonable to presume that paper manufacturing reached Sindh (now part of south Pakistan) before 11th-century with the start of Arab rule in Sindh. Fragments of  Arabic manuscripts found in the Sindhi city ruins of Mansura, which was destroyed "circa" 1030, confirm the use of paper in Sindh. Amir Khusrau of Delhi Sultanate mentions paper-making operations in 1289. In the 15th century, Chinese traveler Ma Huan praised the quality of paper in Bengal, describing it as white paper that is made from "bark of a tree" and is as "glossy and smooth as deer's skin". The use of tree bark as a raw material for paper suggests that the paper manufacturing in the eastern states of India may have come directly from China, rather  than Sultanates formed by West Asian or Central Asian conquests. Paper technology likely arrived in India from China through Tibet and Nepal around mid-7th century, when Buddhist monks freely traveled, exchanged ideas and goods between Tibet and Buddhist centers in India. This exchange is evidenced by the Indian talapatra binding methods that were adopted by Chinese monasteries such as at Tunhuang for preparing sutra books from paper. Most of the earliest surviving sutra books in Tibetan monasteries are on Chinese paper strips held together with Indian manuscript binding methods. Further, the analysis of the woodblock book covers of these historic  manuscripts has confirmed that it was made of tropical wood indigenous to India, not Tibet. Paper in Europe. The oldest known paper document in Europe is the Mozarab Missal of Silos from the 11th century, probably using paper made in the Islamic part of the Iberian Peninsula. They used hemp and linen rags as a source of fiber. The first recorded paper mill in the Iberian Peninsula was in Xàtiva in 1056. Papermaking reached Europe as early as 1085 in Toledo and was firmly established in Xàtiva, Spain by 1150. During the 13th century mills were established in Amalfi, Fabriano , and Treviso, Italy, and other Italian towns by 1340. Papermaking then spread further northwards, with evidence of paper being made in Troyes, France by 1348, in Holland sometime around 1340–1350, and in Nuremberg, Germany by 1390 in a mill set up by Ulman Stromer. This was just about the time when the woodcut printmaking technique was transferred from fabric to paper in the old master print and popular prints. There was a paper mill in Switzerland by 1432 and the first mill in England was set up by John Tate around 1490 near Hertford, but the first commercially successful paper  mill in Britain did not occur before 1588 when John Spilman set up a mill near Dartford in Kent. During this time, paper making spread to Austria by 1469, to Poland by 1491, to Russia by 1576, to the Netherlands by 1586, to Denmark by 1596, and to Sweden by 1612. Arab prisoners who settled in a town called Borgo Saraceno in the Italian Province of Ferrara introduced Fabriano artisans in the Province of Ancona the technique of making paper by hand. At the time they were renowned for their wool-weaving and manufacture of cloth. Fabriano papermakers considered the  process of making paper by hand an art form and were able to refine the process to successfully compete with parchment which was the primary medium for writing at the time. They developed the application of stamping hammers to reduce rags to pulp for making paper, sizing paper by means of animal glue, and creating watermarks in the paper during its forming process. The Fabriano used glue obtained by boiling scrolls or scraps of animal skin to size the paper; it is suggested that this technique was recommended by the local tanneries. The introduction of the first European watermarks in  Fabriano was linked to applying metal wires on a cover laid against the mould which was used for forming the paper. They adapted the waterwheels from the fuller's mills to drive a series of three wooden hammers per trough. The hammers were raised by their heads by cams fixed to a waterwheel's axle made from a large tree trunk. Americas. In the Americas, archaeological evidence indicates that a similar bark-paper writing material was used by the Maya no later than the 5th century CE. Called "amatl" or "amate", it was in widespread use among Mesoamerican cultures until  the Spanish conquest. The earliest sample of amate was found at Huitzilapa near the Magdalena Municipality, Jalisco, Mexico, belonging to the shaft tomb culture. It is dated to 75 BCE. The production of amate is much more similar to paper than papyrus. The bark material is soaked in water, or in modern methods boiled, so that it breaks down into a mass of fibres. They are then laid out in a frame and pressed into sheets. It is a true paper product in that the material is not in its original form, but the base material has much larger fibres  than those used in modern papers. As a result, amate has a rougher surface than modern paper, and may dry into a sheet with hills and valleys as the different length fibres shrink. European papermaking spread to the Americas first in Mexico by 1575 and then in Philadelphia by 1690. United States. The American paper industry began with the establishment of the first paper mill in British America in 1690 by William Rittenhouse of Philadelphia with the help of Pennsylvania's first printer, William Bradford. For two decades it would remain the only mill in the colonies, and for the  next two centuries the city would remain the preeminent center of paper manufacturing and publishing. The first paper mills relied solely on rag paper production, with cotton rags generally imported from Europe. However by the mid-19th century the sulfite process had begun to proliferate in other regions with better access to wood pulp, and by 1880, America had become the largest producer of paper goods in the world. While the Delaware Valley remained an important region in paper production and publishing through the late nineteenth century, Philadelphia was overtaken by regions using these new processes which had greater access to  water power and wood pulp. The earliest of these mills were centered in New England and Upstate New York, the latter of which became home to International Paper, the largest pulp and paper company in the world, which held a 20% market share in 2017, and at its peak produced more than 60% of the continent's newsprint in 1898, before an industry shift to Canada. Chief among papermaking cities in New England and the world was Holyoke, Massachusetts, at one time making 80% of the writing paper of the United States and home to the ill-fated American Writing  Paper Company, the world's largest producer of fine papers by 1920. By 1885 the Paper City, as it is still called, produced 190 tons per day, more than twice Philadelphia's capacity. Quickly it became a hub of paper machinery and turbine technology, host to the largest paper mills in the world in the 1890s, and D. H. & A. B. Tower, the largest paper mill engineering firm in the United States in the 19th century. The Tower Brothers and their associates would be responsible for designing mills on five continents. In the United States the firm supported the Berkshires ' paper industry, building the first mills used to make U.S. currency by the Crane Company, as well as the first sulfite process mills of Kimberly Clark in Wisconsin, allowing the company to be the first west of the Appalachians to adopt the process, with access to vast forest resources. The pulp and paper industry continued to develop in other regions, including California, Ohio's Miami Valley, with centers in Dayton, Hamilton, and Cincinnati, as well as regions of the South, like Texas and Georgia, the latter being home to Georgia Pacific and WestRock, the 2nd and 3rd respective largest paper  producers in the United States today. Wisconsin's industry nevertheless endured and as of 2019 it had far and away the most paper manufacturers in the country, with 34 such enterprises. While only smaller specialty manufacturers remained in Pennsylvania and New England, New York retained 28 mills, followed by Georgia with 20, Michigan with 17, and Alabama with 16 respectively. Paper mills. The use of human and animal powered mills was known to Chinese and Muslim papermakers. However, the evidence for water-powered paper mills is elusive among both prior to the 11th century. Scholars have identified paper mills, likely  human or animal powered, in Abbasid-era Baghdad during 794–795. It is evident that throughout the Islamic lands e.g. Iran, Syria (Hama and Damascus), and North Africa (Egypt and Tripoli) water power mills were extensively used to beat the flax and rag wastes to prepare the paper pulp Donald Hill has identified a possible reference to a water-powered paper mill in Samarkand, in the 11th-century work of the Persian scholar Abu Rayhan Biruni, but concludes that the passage is "too brief to enable us to say with certainty" that it refers to a water-powered paper mill. This  is seen by Halevi as evidence of Samarkand first harnessing waterpower in the production of paper, but notes that it is not known if waterpower was applied to papermaking elsewhere across the Islamic world at the time. Burns remains sceptical, given the isolated occurrence of the reference and the prevalence of manual labour in Islamic papermaking elsewhere prior to the 13th century. Clear evidence of a water-powered paper mill dates to 1282 in the Spanish Kingdom of Aragon. A decree by the Christian king Peter III addresses the establishment of a royal "molendinum", a proper hydraulic mill, in the  paper manufacturing centre of Xàtiva. The crown innovation was operated by the Muslim Mudéjar community in the Moorish quarter of Xàtiva, though it appears to have been resented by sections of the local Muslim papermakering community; the document guarantees them the right to continue the way of traditional papermaking by beating the pulp manually and grants them the right to be exempted from work in the new mill. Paper making centers began to multiply in the late 13th century in Italy, reducing the price of paper to one sixth of parchment and then falling further; paper making centers reached Germany  a century later. The first paper mill north of the Alps was established in Nuremberg by Ulman Stromer in 1390; it is later depicted in the lavishly illustrated "Nuremberg Chronicle". From the mid-14th century onwards, European paper milling underwent a rapid improvement of many work processes. Fiber sources. Before the industrialisation of the paper production the most common fibre source was recycled fibres from used textiles, called rags. The rags were from hemp, linen and cotton. It was not until the introduction of wood pulp in 1843 that paper production was not dependent on recycled materials from ragpickers. It was  not realized at the time how unstable wood pulp paper is. A means of removing printing inks from paper, allowing it to be re-used, was invented by German jurist Justus Claproth in 1774. Today this process is called deinking. 19th-century advances in papermaking. Although cheaper than vellum, paper remained expensive, at least in book-sized quantities, through the centuries, until the advent of steam-driven paper making machines in the 19th century, which could make paper with fibres from wood pulp. Although older machines pre-dated it, the Fourdrinier papermaking machine became the basis for most modern papermaking . Nicholas Louis Robert of Essonnes, France, was granted a patent for a continuous paper making machine in 1799. At the time he was working for Leger Didot with whom he quarrelled over the ownership of the invention. Didot sent his brother-in-law, John Gamble, to meet Sealy and Henry Fourdrinier, stationers of London, who agreed to finance the project. Gamble was granted British patent 2487 on 20 October 1801. With the help particularly of Bryan Donkin, a skilled and ingenious mechanic, an improved version of the Robert original was installed at Frogmore Paper Mill, Hertfordshire, in 1803, followed by  another in 1804. A third machine was installed at the Fourdriniers' own mill at Two Waters. The Fourdriniers also bought a mill at St Neots intending to install two machines there and the process and machines continued to develop. However, experiments with wood showed no real results in the late 18th century and at the start of the 19th century. By 1800, Matthias Koops (in London, England) further investigated the idea of using wood to make paper, and in 1801 he wrote and published a book titled "Historical account of the substances which have been used to describe events, and  to convey ideas, from the earliest date, to the invention of paper." His book was printed on paper made from wood shavings (and adhered together). No pages were fabricated using the pulping method (from either rags or wood). He received financial support from the royal family to make his printing machines and acquire the materials and infrastructure needed to start his printing business. But his enterprise was short lived. Only a few years following his first and only printed book (the one he wrote and printed), he went bankrupt. The book was very well done (strong and had a fine  appearance), but it was very costly. Then in the 1830s and 1840s, two men on two different continents took up the challenge, but from a totally new perspective. Both Friedrich Gottlob Keller and Charles Fenerty began experiments with wood but using the same technique used in paper making; instead of pulping rags, they thought about pulping wood. And at about the same time, by mid-1844, they announced their findings. They invented a machine which extracted the fibres from wood (exactly as with rags) and made paper from it. Charles Fenerty also bleached the pulp so that the paper was white . This started a new era for paper making. By the end of the 19th-century almost all printers in the western world were using wood instead of rags to make paper. Together with the invention of the practical fountain pen and the mass-produced pencil of the same period, and in conjunction with the advent of the steam driven rotary printing press, wood based paper caused a major transformation of the 19th-century economy and society in industrialized countries. With the introduction of cheaper paper, schoolbooks, fiction, non-fiction, and newspapers became gradually available by 1900. Cheap wood based paper  also meant that keeping personal diaries or writing letters became possible and so, by 1850, the clerk, or writer, ceased to be a high-status job. Unfortunately, early wood-based paper deteriorated as time passed, meaning that much of the output of newspapers and books from this period either has disintegrated or is in poor condition; some has been photographed or digitized (scanned). The acid nature of the paper, caused by the use of alum, produced what has been called a slow fire, slowly converting the paper to ash. Documents needed to be written on more expensive rag paper. In  the 2nd half of the 20th century cheaper acid-free paper based on wood was developed, and it was used for hardback and trade paperback books. However, paper that has not been de-acidified was still cheaper, and remains in use (2020) for mass-market paperback books, newspapers, and in underdeveloped countries. Determining provenance. Determining the provenance of paper is a complex process that can be done in a variety of ways. The easiest way is using a known sheet of paper as an exemplar. Using known sheets can produce an exact identification. Next, comparing watermarks with those contained in  catalogs or trade listings can yield useful results. Inspecting the surface can also determine age and location by looking for distinct marks from the production process. Chemical and fiber analysis can be used to establish date of creation and perhaps location.