nyuuzyou/wikis huggingface dataset:
Hummelstown brownstone

== Description ==
A medium-grain, dense sandstone quarried near Hummelstown in Dauphin County, Pennsylvania. Hummelstown brownstone is dark brown with reddish to purplish hues. It was widely used as a building stone.
==Resources and Citations==
* Dictionary of Building Preservation, Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996
* Frank A. Lent, Trade names and Descriptions of Marbles, Limestones, Sandstones, Granites and Other Building Stones Quarried in the United States Canada and other Countries., Stone Publishing Co, New York, 1925
Category:Materials database
Hummingbird

== Description ==
Several species of tiny birds (family Trochilidae) that are capable of hovering and flying backwards. Hummingbirds are native to the Americas with most of the species occurring in South America. They feed on flower nectar and insects. They often have iridescent or gem-like plumage that has been used for decoration in fans, headdresses, and hats.
== Additional Images ==
File:HUMMR.jpg|Giant Hummingbird, Patagona gigas
File:Ruby Throated Humming Bird.jpg|Hummingbird
==Resources and Citations==
* Encyclopedia Britannica, http://www.britannica.com Comment: "hummingbird." Accessed 18 Mar. 2005 .
* Wikipedia: http://en.wikipedia.org/wiki/Hummingbird
Category:Materials database
Humus

== Description ==
Decayed vegetable matter that contains humic acid, fulvic acid, and humin. Humus provides nutrients for plants and in added to soil as a humectant.
==Resources and Citations==
* Thomas Gregory, The Condensed Chemical Dictionary, Reinhold Publishing, New York, 3rd ed., 1942
* G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 334
* Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
* The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
Category:Materials database
Huntite

== Description ==
A soft, white mineral composed of magnesium calcium carbonate. The mineral huntite was first described by Faust in 1953 and its use as a pigment by ancient Egyptians was identified by Riederer in 1974 (Eastaugh et al 2004).
[[[SliderGallery rightalign|Huntite PMA.TIF~FTIR (MFA)|huntiteRS.jpg~Raman]]]
==Physical and Chemical Properties==
Microscopically similar to calcite. Moderate birefringence with strong interference colors.
Composition 	Mg3Ca(CO3)4
Refractive Index	~1.625
==Resources and Citations== 
* B. Ford, I.MacLeod, P.Haydock, "Rock art pigments from Kimberley region of Western Australia: identification of the minerals and conversion mechanisms." Studies in conservation 39, no. 1 (1994), pp. 57-69
* Nicholas Eastaugh, Valentine Walsh, Tracey Chaplin, Ruth Siddall, Pigment Compendium, Elsevier Butterworth-Heinemann, Oxford, 2004 Comment: Refractive index: w=1.679; e=1.500
Category:Materials database
Hxtal NYL-1

== Description ==
A trademark for a two-part epoxy adhesive made with the diglycidyl ether of bisphenol A and triethylene diamine. Hxtal NYL-1 is a low viscosity, colorless, transparent resin that hardens to form a clear strong bond. It has been used for glass and china repair. Hxtal may discolor in direct sunlight.
== Synonyms and Related Terms ==
Hxtal NYL1
== Risks ==
* May discolor in direct sunlight. 
* May yellow slowly with age.
* HisGlassworks: Hxtal NYL1 SDS
==Physical and Chemical Properties==
* Cures in about 1 week at 20C or 2 days at 35C 
* Glass transition temp = 48-55 C
* Refractive Index = 1.51
==Resources and Citations==
* HisGlassworks: Hxtal NYL-1: Information sheet
* S.Williston, "Epoxy Hxtal NYL-1" AIC Newsletter, Feb. 1983, p.12.
* Jane Down, Adhesive projects at the Canadian Conservation Institute, Preprints of the SSCR's 2nd Resins Conference, Sept. 1995, Scottish Society for Conservation & Restoration, Edinburgh
* CoOL DISTLIST - 6 Mar 02 Stephen Koob - RI and newsletter citation
* Conservation termlist : www.hants.org.uk/museums
Category:Materials database
Hyacinth

== Description ==
1) A dark, yellow-red zircon crystal that has been used as a gemstone. Hyacinth is also known as jacinth. The zircon crystal is brittle with a high refractive index. Many catalogs of ancient gemstones mislabel hessonite as jacinth (Ogden 1982). 
2) A plant, Hyacinthus orientalis, that grows from bulbs and produces blue-purple flowers. It is also called jacinth.
== Synonyms and Related Terms ==
hyacynth; jacinth; Hyacinthus orientalis; Hyazinth (Deut.)
== Comparisons ==
==Resources and Citations==
* G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971
* Jack Odgen, Jewellery of the Ancient World, Rizzoli International Publications Inc., New York City, 1982
* Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
* The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
* Wikipedia: http://en.wikipedia.org/wiki/Hyacinth_%28flower%29 accessed Nov. 10, 2004
Category:Materials database
Hydantoin

== Description ==
A white colorless solid. Hydantoin is used as a textile lubricant and as an ingredient in some epoxy resins.
[[[SliderGallery rightalign|hydantoin.jpg~Chemical structure]]]
== Synonyms and Related Terms ==
2,4-imidazolidinedione; glycolylurea
== Risks ==
* Contact may cause eye and skin irritation. 
* May cause adverse reproductive effects. 
* Fisher Scientific: MSDS
==Physical and Chemical Properties==
Soluble in alcohols and alkali hydroxides. Slightly soluble in water, ether.
Composition 	NHCONHCOCH2
CAS 	461-72-3
Melting Point 	220 C
Molecular Weight	mol. wt. = 100.08
==Resources and Citations==
* Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
* Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
* The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 4796
Category:Materials database
Hydrastone

== Description ==
An old brand name for a type of concrete block manufactured in Halifax, Nova Scotia. Hydrastone was used to rebuild many of the homes lost in the 1917 explosion (Bucher 1996).
== Synonyms and Related Terms ==
hydrostone
==Physical and Chemical Properties==
* Dictionary of Building Preservation, Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996
Category:Materials database
Hydrated silica

== Description ==
A jelly-like semi-solid material composed of hydrated silicon dioxide. Hydrated silica, or silicic acid, is prepared by acidifying a solution of sodium silicate. When dried, hydrated silica forms amorphous lumps that are called silica gel. Hydrated silica is used for paper and textile coatings.
== Synonyms and Related Terms ==
silicic acid
==Physical and Chemical Properties==
Composition	SiO2-nH2O
CAS 	7699-41-4
Category:Materials database
Hydraulic cement

== Description ==
A calcium-containing cement that reacts with water to harden, even without drying. Hydraulic cements composed of lime and volcanic ash (pozzolana) were first used in ancient Greece and Rome. The mixture must contain at least 12% of a silicate/aluminate component such as clay, calcium silicate (portland cement), calcium-aluminate, magnesium oxychloride, pozzolana, slag, barium silicate/barium aluminate, brick dust, volcanic ash, pumice, etc. These may be present as original components in the burnt limestone or as additives. In water, the lime mixture hardens to a water resistant solid due to complex exothermic chemical changes involving the hydration of calcium silicates and aluminates. 
Examples are: Roman cement, and portland cement.
== Synonyms and Related Terms ==
ciment hydraulique (Fr.); cimento hidráulico (Port.); water cement; water lime; Roman cement; portland cement; Rosendale cement; slate cement; hydraulic lime; pozzolana
== Risks ==
* Reaction with water may be exothermic
==Resources and Citations==
* J.H.Wills, "Inorganic Adhesives and Cements" in Handbook of Adhesives, I.Skeist (ed.), Van Nostrand Reinhold, New York, 1977. p.117-138. 
* John Ashurst "The Technology and Use of Hydraulic Lime" Building Conservation Directory 1997: Link -(contains specifications and characteristics of different mixture compositions)
* R. J. Gettens, G.L. Stout, Painting Materials, A Short Encyclopaedia, Dover Publications, New York, 1966
* Thomas Gregory, The Condensed Chemical Dictionary, Reinhold Publishing, New York, 3rd ed., 1942
* Susan E. Schur, Conservation Terminology: A review of Past & Current Nomenclature of Materials, Technology and Conservation, Spring (p.34-39); Summer (p.35-38); Fall (p.25-36), 1985
* Dictionary of Building Preservation, Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996
Category:Materials database
Hydraulic lime

== Description ==
A type of lime (calcium oxide) that hardens by the chemical reaction with water. Hydraulic cements composed of lime and volcanic ash (pozzolana) were first used in ancient Greece and Rome. The mixture must contain at least 12% of a silicate/aluminate component such as clay, calcium silicate (portland cement), calcium-aluminate, magnesium oxychloride, pozzolana, slag, barium silicate/barium aluminate, brick dust, volcanic ash, pumice, etc. These may be present as original components in the burnt limestone or as additives. In water, the lime mixture hardens to a water resistant solid due to complex exothermic chemical changes involving the hydration of calcium silicates and aluminates. 
Examples are: Roman cement, and portland cement.
== Synonyms and Related Terms ==
chaux hydraulique (Fr.); cal hidráulica (Port.); hydraulic cement
==Resources and Citations==
* Christine Figueiredo, Alison Henry and Stafford Holmes " Hydraulic lime Production, Building Conservation Directory link
* G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 454
* Susan E. Schur, Conservation Terminology: A review of Past & Current Nomenclature of Materials, Technology and Conservation, Spring (p.34-39); Summer (p.35-38); Fall (p.25-36), 1985
* Dictionary of Building Preservation, Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996
* Building Conservation Directory: website
Category:Materials database
Hydraulic mortar

== Description ==
A mortar that is capable of hardening under water. See hydraulic cement
== Synonyms and Related Terms ==
mortier hydraulique (Fr.)
==Resources and Citations==
* Dictionary of Building Preservation, Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996
* Art and Architecture Thesaurus Online, https://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000
Category:Materials database
Hydro-Stone

== Description ==
[U.S.Gypsum] A registered trademark for a gypsum cement composition. Hydro-Stone® has been used for casting sculptures and relief ornaments. It has low shrinkage but can yellow with age.
== Synonyms and Related Terms ==
Hydrostone; hydrocal
== Risks ==
* USG: SDS
==Resources and Citations==
* USG: Hydro-stone
* G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 38
* Marie Svoboda, Conservation Survey Index, unpublished, 1997
Category:Materials database
Hydrocal White gypsum cement

== Description ==
[U.S.Gypsum] A registered trademark for a calcined gypsum product. Hydrocal® white gypsum cement is a strong multipurpose casting plaster. A modified form, called Statuary Hydrocal® gypsum cement, produces harder and stronger casts.
== Synonyms and Related Terms ==
Statuary Hydrocal gypsum cement
== Risks ==
* USG: SDS
==Resources and Citations==
* USG: Hydrocal
* Art and Architecture Thesaurus Online, https://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000
Category:Materials database
Hydrocellulose

== Description ==
Cellulose that is partially hydrolyzed to form a gelatinous mass. Hydrocellulose is made by cooking, beating, acid-treating or alkali-treating cellulose fibers until at least 8-12% water is absorbed into the cellulose fibers. This increases the physical strength and decreases opacity of the cellulose. Hydrated cellulose is used for making greaseproof papers, mercerized cotton and viscose rayon.
== Synonyms and Related Terms ==
hydrated cellulose; amyloid
== Risks ==
* Combustible.
==Resources and Citations==
* Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
* The Dictionary of Paper, American Paper Institute, New York, Fourth Edition, 1980
* E.J.LaBarre, Dictionary and Encyclopedia of Paper and Paper-making, Swets & Zeitlinger, Amsterdam, 1969
* Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
Category:Materials database
Hydrochloric acid

== Description ==
As aqueous solution of hydrogen chloride. Hydrochloric acid is a colorless, pungent, highly corrosive liquid, however, some acid solutions may be yellowish due to dissolved iron impurities. Concentrated, or fuming, hydrochloric acid contains 38% hydrogen chloride. A dilute solution containing 5% hydrogen chloride is commonly known as muriatic acid. Hydrochloric acid is used as an etchant for metal plates, for processing black and white photographs and for making glass iridescent. In industry, hydrochloric acid is used in food processing, ore reduction and metal cleaning. Some grades of hydrochloric acid may have impurities such as sulfuric acid, nitric acid, sodium chloride, iron, and chlorine.
== Synonyms and Related Terms ==
HCl; muriatic acid; acid of sea salt; marine acid; spirit of salt
== Risks ==
* Toxic by ingestion and inhalation. 
* Skin contact is corrosive. 
* ThermoFisher: SDS
== Physical and Chemical Properties ==
Soluble in water, ethanol and benzene.
pH of concentrated solution=0.1; pH of 0.1N solution=1.1, pH of 0.01N solution=2.0
Composition 	HCl
CAS 	7647-01-0
Melting Point 	-83.55 C
Density 	1.19 g/ml
Molecular Weight	mol. wt. = 36.46
Boiling Point 	19.51 C
==Resources and Citations==
* Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
* The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 4821
* Matt Roberts, Don Etherington, Bookbinding and the Conservation of Books: a Dictionary of Descriptive Terminology, U.S. Government Printing Office, Washington DC, 1982
* Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
* Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
* The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
* S.R.Trotman, E.R. Trotman, Textile Analysis, J.B. Lippincott Company, Philadelphia, 1932
* Michael McCann, Artist Beware, Watson-Guptill Publications, New York City, 1979
* Susan E. Schur, Conservation Terminology: A review of Past & Current Nomenclature of Materials, Technology and Conservation, Spring (p.34-39); Summer (p.35-38); Fall (p.25-36), 1985
* Art and Architecture Thesaurus Online, https://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000
* Photographic chemicals: www.jetcity.com/~mrjones/chemdesc.htm
* CRC Handbook of Chemistry and Physics, Robert Weast (ed.), CRC Press, Boca Raton, Florida, v. 61, 1980 Comment: pH of concentrated solution=0.1; pH of 0.1N solution=1.1, pH of 0.01N solution=2.0
Category:Materials database
Hydrofluoric acid

== Description ==
An aqueous solution of hydrogen fluoride. Hydrofluoric acid is a colorless fuming liquid, that when concentrated contains 38% hydrogen fluoride. Hydrofluoric acid is one of the few materials that will dissolve silicon dioxide and, as such, is used for etching and polishing crystal, glass, and enamel. It is also used for cleaning precious metals and removing efflorescence from brick and stone.
== Synonyms and Related Terms ==
HF; fluohydric acid; fluoric acid; hydrogen fluoride solution
== Risks ==
* Toxic by ingestion and inhalation. 
* Skin contact is corrosive. Causes severe burns. 
* Fisher Scientific: MSDS
==Physical and Chemical Properties==
Dissolves most metals except for platinum and gold.
Composition 	HF
CAS 	7664-39-3
Melting Point 	-71 C
Density 	1.15-1.18 g/ml
Molecular Weight	mol. wt. = 20.005
Boiling Point 	112.2 C
==Resources and Citations==
* G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 405
* Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
* Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
* Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
* The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 4831
* The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
* Art and Architecture Thesaurus Online, https://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000
* Michael McCann, Artist Beware, Watson-Guptill Publications, New York City, 1979
Category:Materials database
Hydrogen

== Description ==
The lightest of all chemical elements. Hydrogen is a colorless, odorless and tasteless gas. Although it is considered the most abundant element in the universe, it is only present in the earth's atmosphere at a concentration of 50 ppm. Most of the hydrogen on earth is in the form of water. It is the primary source of energy in the sun and stars. Hydrogen was first recognized as an element by Cavendish in 1766 and named by Lavoisier in 1783. Hydrogen is used in rocket fuels, in balloon, in welding torches and in the production of ammonia and methanol.
== Synonyms and Related Terms ==
H; inflammable gas (prior to 1800); Waterstof (Ned.); Waterstof (Fr.); Wasserstoff (Deut.); idrogeno (It.); Hidrogênio (Port.); hidrógeno (Esp.); Väte (Sven.)
== Risks ==
* Highly flammable and explosive. 
* An asphyxiant at high concentrations. 
* Airgas: SDS
== Physical and Chemical Properties ==
* Slightly soluble in water, ethanol and ether. 
* Burns with a pale blue flame.
Composition 	H (atomic no. 1)
CAS 	1333-74-0
Melting Point 	-259.2 C
Molecular Weight	atomic wt = 1.0079
Boiling Point 	-252.77 C
== Resources and Citations ==
* Web Elements: Website
* Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
* Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
* The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
* Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
* The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry # 4833
* Susan E. Schur, Conservation Terminology: A review of Past & Current Nomenclature of Materials, Technology and Conservation, Spring (p.34-39); Summer (p.35-38); Fall (p.25-36), 1985
Category:Materials database
Hydrogen bond

== Description ==
A type of chemical bond. A hydrogen bond is formed when a hydrogen atom in a molecule, such as water, is attracted to an electronegative element, such as F, N, or O, in another molecule. The hydrogen atom forms the positive end of a bridge, called a hydrogen bond, between itself and the other electronegative element. Hydrogen bonds are about one-tenth as strong as covalent bonds. They influence boiling points, melting points, and crystallinity of materials.
== Synonyms and Related Terms ==
hydrogen bonding
Category:Materials database
Hydrogen chloride

== Description ==
A colorless, fuming gas with a suffocating odor. Hydrogen chloride is the byproduct in the production of organic chlorides. It is used in organic synthesis and for the chlorination of rubber.
== Synonyms and Related Terms ==
muriatic acid gas; anhydrous hydrochloric acid
== Risks ==
* Nonflammable. 
* Avoid all contact. 
* Corrosive to skin and eyes. 
* Toxic by inhalation. 
* Airgas: SDS
==Physical and Chemical Properties==
Soluble in water, ethanol and ether.
Composition 	HCl
CAS 	7647-01-0
Melting Point 	-114 C
Density 	1.00 g/ml
Molecular Weight	mol. wt. = 36.5
Boiling Point 	-85 C
==Resources and Citations==
* G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 464
* Susan E. Schur, Conservation Terminology: A review of Past & Current Nomenclature of Materials, Technology and Conservation, Spring (p.34-39); Summer (p.35-38); Fall (p.25-36), 1985
* The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 4835
* Thomas Gregory, The Condensed Chemical Dictionary, Reinhold Publishing, New York, 3rd ed., 1942
* The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
Category:Materials database
Hydrogen cyanide

== Description ==
A clear, colorless gas or liquid that smells faintly of almonds. Hydrogen cyanide is usually sold as a 2-10% aqueous solution of hydrocyanic acid. Hydrogen cyanide has been used in the past as a fast-acting disinfectant and fumigant. However, it is on a DO NOT USE list of museum fumigants because of its dangerous toxicity and because it can tarnish metals and leave a slight odor on ethnographic materials (Zycherman and Schrock 1988). Hydrogen cyanide is also used in photographic and electroplating solutions as well as in the manufacture of acrylic polymers, dyes, and chelating agents.
== Synonyms and Related Terms ==
HCN; prussic acid; hydrocyanic acid; formonitrile; Aeor; Discoids; Cyanogas; Cyclon
== Risks ==
* Extremely toxic by inhalation, ingestion and skin absorption. LD50=6.4 mg/kg. 
* It is one of the fastest acting toxins known. Antidotes are sodium nitrite and sodium thiosulfate. 
* Flammable and explosive. 
* Can discolor and react with metals at RH above 30%. 
* Airgas: SDS
==Physical and Chemical Properties==
Miscible with water, ethanol. Slightly soluble in ether.
Composition 	HCN
CAS 	74-90-8
Melting Point 	-13.4 C
Molecular Weight	mol. wt. = 27.03
Boiling Point 	25.6 C
==Resources and Citations==
* Lynda A. Zycherman, J.Richard Schrock, A Guide to Museum Pest Control, FAIC and Association of Systematics Collections, Washington DC, 1988
* L. Goldberg, A History Of Pest Control Measures In The Anthropology Collections, National Museum Of Natural History, Smithsonian Institution, JAIC (35):23-43, 1996
* Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
* The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
* Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
* The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 4836
* G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 404
* Hermann Kuhn, Conservation and Restoration of Works of Art and Antiquities, Butterworths, London, 1986
* Stephen R. Edwards, Bruce M. Bell, Mary Elizabeth King, Pest Control in Museums: a Status Report 1980, Association of Sytematics Collections, Washington DC, 1980
* Michael McCann, Artist Beware, Watson-Guptill Publications, New York City, 1979
* G.Caneva, M.P.Nugari, O.Salvadori, Biology in the Conservation of Works of Art, ICCROM, Rome, 1991
Category:Materials database
Hydrogen fluoride

== Description ==
A colorless, corrosive gas that is readily absorbed in water. Hydrogen fluoride dissolve silica, silicic acid, and glass. It is used as a catalyst and as a fluorinating agent.
== Synonyms and Related Terms ==
hydrofluoric acid gas; anhydrous hydrofluoric acid
== Risks ==
* Toxic by inhalation, ingestion. Corrosive to skin and eyes. Nonflammable.
* ThermoFisher: SDS
== Physical and Chemical Properties ==
Soluble in water, ethanol. Slightly soluble in benzene, toluene, xylene.
Composition 	HF
CAS 	7664-39-3
Melting Point 	-83 C
Molecular Weight	mol. wt. = 20.005
Boiling Point 	19.5 C
Category:Materials database