Information: - Johann Alois Senefelder (6 November 1771 26 February 1834) was a German actor and playwright who invented the printing technique of lithography in 1796. - Lithography is a method of printing originally based on the immiscibility of oil and water. The printing is from a stone (lithographic limestone) or a metal plate with a smooth surface. It was invented in 1796 by German author and actor Alois Senefelder as a cheap method of publishing theatrical works. Lithography can be used to print text or artwork onto paper or other suitable material. - Photochrom, sometimes spelled Fotochrom or Photochrome (although this term more often refers to later photographic postcards), and also called the Aac process, is a process for producing colorized images from black-and-white photographic negatives via the direct photographic transfer of a negative onto lithographic printing plates. The process is a photographic variant of chromolithography, a broader term that refers to color lithography in general. - Lithographic limestone is hard limestone that is sufficiently fine-grained, homogeneous and defect free to be used for lithography. Geologists use the term "lithographic texture" to refer to a grain size under 1/250mm. The term "sublithographic" is sometimes used for homogeneous fine-grained limestone with a somewhat coarser texture. - Printing is a process for reproducing text and images using a master form or template. The earliest examples include Cylinder seals and other objects such as the Cyrus Cylinder and the Cylinders of Nabonidus. The earliest known form of woodblock printing came from China dating to before 220 A.D. Later developments in printing include the movable type, first developed by Bi Sheng in China. Johannes Gutenberg introduced mechanical movable type printing to Europe in the 15th century. His printing press played a key role in the development of the Renaissance, Reformation, the Age of Enlightenment, and the scientific revolution and laid the material basis for the modern knowledge-based economy and the spread of learning to the masses. - Limestone is a sedimentary rock, composed mainly of skeletal fragments of marine organisms such as coral, forams and molluscs. Its major materials are the minerals calcite and aragonite, which are different crystal forms of calcium carbonate (CaCO). - Paper is a thin material produced by pressing together moist fibres of cellulose pulp derived from wood, rags or grasses, and drying them into flexible sheets. It is a versatile material with many uses, including writing, printing, packaging, cleaning, and a number of industrial and construction processes. - Chromolithography is a method for making multi-colour prints . This type of colour printing stemmed from the process of lithography , and it includes all types of lithography that are printed in colour . When chromolithography is used to reproduce photographs , the term photochrome is frequently used . Lithographers sought to find a way to print on flat surfaces with the use of chemicals instead of relief or intaglio printing . Chromolithography became the most successful of several methods of colour printing developed by the 19th century ; other methods were developed by printers such as Jacob Christoph Le Blon , George Baxter and Edmund Evans , and mostly relied on using several woodblocks with the colours . Hand - colouring also remained important ; elements of the official British Ordnance Survey maps were coloured by hand by boys until 1875 . The initial technique involved the use of multiple lithographic stones , one for each colour , and was still extremely expensive when done for the best quality results . Depending on the number of colours present , a chromolithograph could take months to produce , by very skilled workers . However much cheaper prints could be produced by simplifying both the number of colours used , and the refinement of the detail in the image . Cheaper images , like advertisements , relied heavily on an initial black print ( not always a lithograph ) , on which colours were then overprinted . To make an expensive reproduction print as what was once referred to as a '' '' chromo '' '' , a lithographer , with a finished painting in front of him , gradually created and corrected the many stones using proofs to look as much as possible like the painting in front of him , sometimes using dozens of layers . What entity does 'chromolithography' has the relation 'subclass of' with?
A:
color lithography