nyuuzyou/wikis huggingface dataset:
Methanol

== Description ==
A clear, colorless, slightly volatile solvent with a slight alcoholic smell. Methanol, commonly known as methyl alcohol, was discovered in 1661 by R. Boyle. It is made by the destructive distillation of wood, peat, and lignite as well as by the partial oxidation of natural gas hydrocarbons. Methanol is highly polar and is usually a better solvent than ethanol. It is used in the manufacture of several organic compounds. Methanol is also used as a solvent for lacquers, shellac, rosin, dyes, oils, paint removers, and degreasing compounds. Because of its toxicity, methanol is used to denature ethanol.
== Synonyms and Related Terms ==
methanol (IUPAC); methyl alcohol; wood alcohol; wood spirits; pyroxylic spirit; wood naphtha; methyl hydrate; methylic alcohol; Columbian spirits; carbinol
== Risks ==
* Flammable. Flash point = 12 C (54 F) 
* Dangerous fire risk. Forms an explosive mixture with air. 
* Toxic by ingestion and inhalation. Ingestion of small amounts will cause blindness. 
* Fisher Scientific: MSDS
* EPA lists methanol as hazardous waste due to its ignitability; concentrations over 10% must be disposed of appropriately
== Physical and Chemical Properties ==
Miscible with water, ethanol, ether, benzene, ketones and most other organic solvents. Methanol burns with a pale blue flame.
Composition 	CH3OH
CAS 	67-56-1
Melting Point 	-97.8 C
Density 	0.7866 g/ml
Molecular Weight	mol. wt.=32.04
Refractive Index	1.326-1.329
Boiling Point 	64.7 C
== Resources and Citations ==
* R. J. Gettens, G.L. Stout, Painting Materials, A Short Encyclopaedia, Dover Publications, New York, 1966
* G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 505
* Reed Kay, The Painter's Guide To Studio Methods and Materials, Prentice-Hall, Inc., Englewood Cliffs, NJ, 1983
* Ralph Mayer, A Dictionary of Art Terms and Techniques, Harper and Row Publishers, New York, 1969 (also 1945 printing)
* Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
* 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
* Michael McCann, Artist Beware, Watson-Guptill Publications, New York City, 1979
* Kurt Wehlte, The Materials and Techniques of Painting, Van Nostrand Reinhold Co., New York, 1975
* The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 6024; ref. index = 1.329
* Encyclopedia Britannica, http://www.britannica.com Comment: "Methanol." (Accessed 7 July 2004).
* 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
* CRC Handbook of Chemistry and Physics, Robert Weast (ed.), CRC Press, Boca Raton, Florida, v. 61, 1980 Comment: ref. index=1.326
Category:Materials database
Methocel

== Description ==
[Dow Chemical Co.] A trademark for series of water-soluble polymers that contain methyl cellulose. Methocel (TM) dissolves in water to form an adhesive paste that has a neutral pH. It used in industry as a thickening, emulsifying and dispersing agent. Methocel (TM) is also used as an ink additive to improve gloss and to decrease solubility in grease and oils. 
* Methocel A4C: contains methyl cellulose (85-99%), water, and sodium chloride 
* Methocel A4CP: contains methyl cellulose
== Synonyms and Related Terms ==
Tylose® [SE Tylose]; Aqualon® [Aqualon]; Klucel® [Aqualon];
[[[SliderGallery rightalign|MFA- Methocel.jpg~FTIR]]]
==Physical and Chemical Properties==
Soluble in water.
==Resources and Citations==
* Dow Chemical: Website
* R.Feller, M.Wilt, Evaluation of Cellulose Ethers for Conservation, in Research in Conservation Series, Getty Conservation Institute, 1990.
* Thomas Gregory, The Condensed Chemical Dictionary, Reinhold Publishing, New York, 3rd ed., 1942
* 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
* Kurt Wehlte, The Materials and Techniques of Painting, Van Nostrand Reinhold Co., New York, 1975
* Conservation Support Systems, Catalog, 1997
* A Glossary of Paper Conservation Terms, Margaret Ellis (ed.), Conservation Center of the Institute of Fine Arts, New York City, 1998
Category:Materials database
Methoprene

== Description ==
A knock-down type insecticide that does not kill, but rather prevents infestations by breaking the biological life cycle. Methoprene mimics a juvenile insect hormone and prevents larvae from becoming adults and reproducing. It is an amber-colored liquid with a faint fruity odor.
== Synonyms and Related Terms ==
(E,E)-11-methoxy-3,7,11-trimethyl-2,4-dodecadienoic acid 1-methylethyl ester; ZR-515; Precor; Altosid
==Risks==
* May be harmful by inhalation, ingestion, or skin absorption 
* Very toxic to aquatic life.
* Cayman Chemical: Methoprene
==Physical and Chemical Properties==
Composition 	C19H34O3
Molecular Weight	mol. wt. = 310.48
==Resources and Citations==
* Wikipedia: [https://en.wikipedia.org/wiki/Methoprene Methoprene} Accessed August 2022
Category:Materials database
Methoxy magnesium methyl carbonate

== Description ==
A nonaqueous solution used for the deacidification of paper.
== Synonyms and Related Terms ==
methoxy magnesium methyl carbonate; MMC; MMMC; methyl magnesium carbonate; Wei T'o solution; Stile’s reagent
==Risks==
* NIH: Technical and Safety information
==Physical and Chemical Properties==
pH in methanol is about 8.5
Composition	3CH3OMgOCO2CH3.-CO2
==Resources and Citations==
* S.Hackney, J.Townsend, N.Wyplosz "Studies on the Deacidification of Canvas Supports with MMC" ICOM Edinburgh 1996 p 271-275
* Matt Roberts, Don Etherington, Bookbinding and the Conservation of Books: a Dictionary of Descriptive Terminology, U.S. Government Printing Office, Washington DC, 1982
* Book and Paper Group, Paper Conservation Catalog, AIC, 1984, 1989
* Website address 1 Comment: www.knaw.nl/ecpa/ink/html/cons.html
Category:Materials database
Methoxychlor

== Description ==
A white crystalline powder used as an insecticide. Methoxychlor was introduced as an insecticide in 1945. It is in the same chemical family as DDT but it is a more potent insecticide that is effective against most insects and their larvae. Methoxychlor has a long residual effect. It is currently restricted in the U.S. and is not available for use in public buildings.
== Synonyms and Related Terms ==
methoxy DDT; DMDT; 2,2-bis(p-methoxyphenol)-1,1,1-trichloroethane; Chemform; Marlate[DuPont]; Moxie
== Risks ==
* Overexposure causes convulsions and liver and kidney damage. 
* Potential carcinogen. 
* Decomposes when heated to produce toxic fumes of chlorides. 
* Chemical Book: SDS
==Physical and Chemical Properties==
Soluble in ethanol. Insoluble in water.
Composition 	Cl3CCH(C6H4OCH3)2
CAS 	72-43-5
Melting Point 	78-78.2 C
Molecular Weight	mol. wt. = 345.65
Category:Materials database
Methyl Cellosolve

== Description ==
[Union Carbide] A registered trademark name for ethylene glycol monomethyl ether.
== Synonyms and Related Terms ==
ethylene glycol monomethyl ether; 2-methoxy ethanol
== Risks ==
* SRL Chemicals: MSDS
==Resources and Citations==
* Michael McCann, Artist Beware, Watson-Guptill Publications, New York City, 1979
Category:Materials database
Methyl Cellosolve acetate

== Description ==
[Union Carbide] A registered trademark name for ethylene glycol monomethyl ether acetate.
[[[SliderGallery rightalign|methyl Cellosolve_ acetate.jpg~Chemical structure]]]
== Synonyms and Related Terms ==
ethylene glycol monomethyl ether acetate; 2-methoxyethyl acetate; 2-methoxyethanol acetate
== Risks ==
* Flammable. Flash point = 45 C.
* Hydrosil: SDS
==Physical and Chemical Properties==
Composition 	C5H10O3
CAS 	110-49-6
Melting Point 	-65 C
Density 	1.01 g/ml
Molecular Weight	mol. wt. = 118.1
Boiling Point 	145 C
==Resources and Citations==
* Michael McCann, Michael McCann, Artist Beware, Watson-Guptill Publications, New York City, 1979
* Molecular Probes - www.probes.com/probes/legal/html
Category:Materials database
Methyl acetate

== Description ==
A colorless solvent with a fragrant odor. Methyl acetate is the methyl ester of acetic acid. It is used as a solvent for cellulose nitrate and as a paint remover. It is also used in the manufacture of artificial leather.
[[[SliderGallery rightalign|methyl acetate.jpg~Chemical structure]]]
== Synonyms and Related Terms ==
methyl ester of acetic acid
== Risks ==
* Overexposure can cause skin irritation. 
* Ingestion may cause headaches, drowsiness and optical atrophy. 
* May decompose in aqueous solutions to form acetic acid. 
* Flammable. Flash point = -9C (15F). Fire and explosion risk. 
* ThermoFisher: SDS
==Physical and Chemical Properties==
Soluble in water. Miscible in ethanol and ether. 
Hydrolyzes in water to acetic acid.
Composition 	CH3COOCH3
CAS 	79-20-9
Melting Point 	-98 C
Density 	0.9279 g/ml
Molecular Weight	mol. wt. = 74
Refractive Index	1.3619
Boiling Point 	56.9 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 6089; ref. index=1.3619
* Wikipedia: http://en.wikipedia.org/wiki/Methyl_acetate (Accessed Jan. 6 2006)
* 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
* CRC Handbook of Chemistry and Physics, Robert Weast (ed.), CRC Press, Boca Raton, Florida, v. 61, 1980 Comment: ref. index=1.360
Category:Materials database
Methyl acetone

== Description ==
1) Common name for an impure mixture that contains about 50% 
acetone, 30% 
methyl acetate and 20% 
methanol. Methyl acetone is used as a solvent for lacquers,and resins as well as a paint and varnish remover.
2) Synonym for 
methyl ethyl ketone.
== Risks ==
Flammable. Dangerous fire risk. Toxic by ingestion.
==Physical and Chemical Properties==
Miscible with most hydrocarbon solvents and oils.
==Resources and Citations==
* G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 9
* Thomas Gregory, The Condensed Chemical Dictionary, Reinhold Publishing, New York, 3rd ed., 1942
* Ralph Mayer, A Dictionary of Art Terms and Techniques, Harper and Row Publishers, New York, 1969 (also 1945 printing)
Category:Materials database
Methyl bromide

== Description ==
A colorless gas used as an insect fumigant and as a solvent. Methyl bromide has a weak chloroform-like odor at high concentrations but provides no warning odor at normal usage levels. Methyl bromide has been used extensively for control of wood boring insects, but it is no longer recommended for use in museums. It is currently used for fumigating crops and soil and is registered for use as a space fumigant. Methyl bromide reacts with basic amines. It also reacts with sulfur containing materials to form foul-smelling mercaptans, thio-ethers, and disulfides. This unpleasant odor can remain for several weeks. The following materials should not be fumigated with methyl bromide: vulcanized rubber sponge, foam rubber, vulcanized natural rubber, fur, hair, feathers, leather, vellum, parchment, wool, silk, viscose rayon, paper, silver polishing papers, color film, photographs, and photographic chemicals. Some impurities in methyl bromide may corrode zinc, tin, lead, and iron. Methyl bromide can also dissolve drying oils.
== Synonyms and Related Terms ==
bromomethane; monobromomethane; Embafume; Brom-O-Gas; Methogas; Terr-O-Gas; maltox
== Risks ==
* Toxic by inhalation, ingestion and skin absorption. TLV=65 mg/m3 
* Skin contact causes irritation and burns. 
* Potential carcinogen and teratogen. 
* Combustible. Burning produces toxic fumes including hydrogen bromide, bromine and carbon oxybromide. 
* Airgas: SDS
==Physical and Chemical Properties==
* Soluble in ethanol, chloroform, ether, carbon disulfide, carbon tetrachloride, benzene. 
* Methyl bromide is used to extract oils from seeds, nuts and flowers.
Composition 	CH3Br
CAS 	74-83-9
Melting Point 	-93.66 C
Molecular Weight	mol. wt. = 94.9
Boiling Point 	3.56 C
==Resources and Citations==
* Dow Chemical. "Commodities unsuited for methyl bromide fumigation" Dow Fumifacts, 4:2 (1957). 
* J.Dawson, "Solving Museum Insect Problems: Chemical Control" CCI Technical Bulletin No. 15. 
* L. Goldberg, A History Of Pest Control Measures In The Anthropology Collections, National Museum Of Natural History, Smithsonian Institution, JAIC (35):23-43, 1996
* 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 6108
* Lynda A. Zycherman, J.Richard Schrock, A Guide to Museum Pest Control, FAIC and Association of Systematics Collections, Washington DC, 1988
* Matt Roberts, Don Etherington, Bookbinding and the Conservation of Books: a Dictionary of Descriptive Terminology, U.S. Government Printing Office, Washington DC, 1982
* 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
* G.Caneva, M.P.Nugari, O.Salvadori, Biology in the Conservation of Works of Art, ICCROM, Rome, 1991
Category:Materials database
Methyl butyl ketone

== Description ==
A colorless liquid with a sweet ketone-like odor. Methyl butyl ketone is used as a solvent for 
lacquer and 
plastics as well as a component in paint and varnish 
removers.
== Synonyms and Related Terms ==
MBK; 2-hexanone; propylacetone
[[[SliderGallery rightalign|methyl butyl ketone.jpg~Chemical structure]]]
== Risks ==
* Flammable. Flash point = 23C 
* Moderate fire risk. 
* Inhalation, ingestion and skin absorption causes irritation. 
* Narcotic effects at high concentrations. 
* May be toxic. 
* ThermoFisher: SDS
== Physical an Chemical Properties ==
Soluble in ethanol, ether. Slightly soluble in water.
Composition 	CH3COC4H9
CAS 	591-78-6
Melting Point 	-57 C
Density 	0.830 g/ml
Molecular Weight	mol. wt. = 100.2
Refractive Index	1.395
Boiling Point 	127 C
==Resources and Citations==
* Michael McCann, Artist Beware, Watson-Guptill Publications, New York City, 1979
* The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 6112
* CRC Handbook of Chemistry and Physics, Robert Weast (ed.), CRC Press, Boca Raton, Florida, v. 61, 1980 Comment: ref. index=1.395
Category:Materials database
Methyl demeton

== Description ==
A light yellow liquid formerly used as an 
insecticide. Methyl demeton works as a cholinesterase inhibitor. It was first developed in 1955 and patented to Bayer in 1959.
== Synonyms and Related Terms ==
methyl mercaptophos; methyl systox; O,O-dimethyl-O-(2-ethylthio)ethyl phosphorothioate
== Risks ==
* Toxic by ingestion, inhalation and skin absorption. 
* EChemi: SDS
== Physical and Chemical Properties ==
Soluble in organic solvents. Slightly soluble in water.
Composition 	C6H15O3PS2
CAS 	8022-00-2
Molecular Weight	mol. wt. = 230.29
Category:Materials database
Methyl ethyl ketone

== Description ==
A colorless liquid 
solvent with an acetone-like odor. Methyl ethyl ketone, or MEK, is used as a solvent for 
cellulose nitrate lacquers, 
vinyl films, 
acrylic coatings, 
inks, and 
alkyd (
Glyptal) resins. It is also used as a component in 
paint removers and dry cleaning fluids. MEK does not dissolve 
cellulose acetate or most 
waxes.
== Synonyms and Related Terms ==
2-butanone; MEK; ethyl methyl ketone; ethylmethyl ketone; 2-oxobutane; methyl acetone; methylethyl ketone
[[[SliderGallery rightalign|methyl ethyl ketone.jpg~Chemical structure]]]
==Risks ==
* Flammable. Flash point = -9C Dangerous fire risk. Explosive in limits air 2-10%. 
* Toxic by inhalation. 
* Skin contact causes dermatitis. 
* Ingestion causes vomiting and abdominal pain.
* Flinn Scientific: SDS
* EPA lists MEK as hazardous waste due to ignitability; concentrations over 10% must be disposed of appropriately
== Physical and Chemical Properties ==
Miscible with water, ethanol, ether, benzene and oils.
Composition 	CH3COCH2CH3
CAS 	78-93-3
Melting Point 	-86.4 C
Density 	0.805 g/ml
Molecular Weight	mol. wt.= 72.12
Refractive Index	1.379
Boiling Point 	79.6 C
== Comparisons ==
==Resources and Citations==
* R. J. Gettens, G.L. Stout, Painting Materials, A Short Encyclopaedia, Dover Publications, New York, 1966 Comment: acts well on cellulose acetate
* Reed Kay, The Painter's Guide To Studio Methods and Materials, Prentice-Hall, Inc., Englewood Cliffs, NJ, 1983
* Ralph Mayer, A Dictionary of Art Terms and Techniques, Harper and Row Publishers, New York, 1969 (also 1945 printing)
* Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993 Comment: does not dissolve cellulose acetate and most waxes
* Michael McCann, Artist Beware, Watson-Guptill Publications, New York City, 1979
* 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 6149; ref. index=1.379
* The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
* CRC Handbook of Chemistry and Physics, Robert Weast (ed.), CRC Press, Boca Raton, Florida, v. 61, 1980 Comment: ref. index=1.377
Category:Materials database
Methyl ethyl ketone peroxide

== Description ==
A colorless liquid that is a strong oxidizing agent. Methyl ethyl ketone peroxide is used as a catalyst in the curing of some polymers such as polyester, acrylic and silicone resins. Specifically, this is the catalyst used in 
Bio-Plastic® (Ward's Natural Science) polyester resins that is often used to embed paint cross sections. Methyl ethyl ketone peroxide is used industrially to cure fiberglass-reinforced plastics.
== Synonyms and Related Terms ==
ethyl methyl ketone peroxide
== Risks ==
* Highly flammable. 
* Flash point = 58C. 
* Can be decomposed by sunlight. 
* Explosion risk when mixed with inorganic acids, accelerators or some organic materials such as acetone. 
* Skin contact causes irritation and burns.
* Sigma-Aldrich: SDS
==Physical and Chemical Properties==
Composition 	C8H16O4
CAS 	1338-23-4
Melting Point	-30 C
Density 	0.815 g/ml
Boiling Point	70 C (dec)
Category:Materials database
Methyl isobutyl ketone

== Description ==
A colorless liquid solvent with an acetone-like odor. Methyl isobutyl ketone is used as a solvent for 
cellulose nitrate, 
gums, 
resins, 
fats, 
waxes, and 
oils. It is used commercially in 
paints, 
varnishes, and 
lacquers and as a denaturant for 
ethanol.
== Synonyms and Related Terms ==
MIBK; hexone; 4-methyl-2-pentanone; isopropylacetone
[[[SliderGallery rightalign|methyl isobutyl ketone.jpg~Chemical structure]]]
== Other Properties ==
Miscible in most organic solvents. Slightly soluble in water.
Composition 	(CH3)2CHCH2OCH3
CAS 	108-10-1
Melting Point 	-85
Density 	0.8061
Molecular Weight	mol. wt. = 100.16
Refractive Index	1.3861
Boiling Point 	116-117
== Hazards and Safety ==
Flammable. Flash point 14C (57F). Dangerous fire risk. Explosive limits in air 1.4-7.5%. 
Moderate toxicity by inhalation, ingestion and skin absorption. 
Mallinckrodt Baker: MSDS
== Sources Checked for Data in Record ==
* R. J. Gettens, G.L. Stout, Painting Materials, A Short Encyclopaedia, Dover Publications, New York, 1966
* Reed Kay, The Painter's Guide To Studio Methods and Materials, Prentice-Hall, Inc., Englewood Cliffs, NJ, 1983
* 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 6164
Category:Materials database
Methyl methacrylate

== Description ==
A colorless, volatile liquid that is the monomer for 
polymethyl methacrylate resins. Methyl methacrylate forms a clear glasslike, thermoplastic polymer that is light weight but hard to break. Methyl methacrylate polymerizes with heat, light, ionizing radiation, or catalysts. It can be copolymerized with many other monomers including other acrylate and methacrylate esters.
[[[SliderGallery rightalign|MFA- Methyl methacrylate.jpg~FTIR|methyl methacrylate.jpg~Chemical structure]]]
== Synonyms and Related Terms ==
methacrylic acid methyl ester; methyl 2-methylpropenoate; metacrilato de metilo (Esp.); 2-metilpropenoato de metilo (Esp.); méthylméthacrylate (Fr.); metilmetacrilato (It.); acrilato de metilo (Port.)
== Risks ==
* Highly flammable. Flash point = 10 C. Explosive limits in air 2.1-12.5%. 
* Hazardous by ingestion, inhalation and skin absorption. 
* Contact causes irritation. 
* ThermoFisher; SDS
== Physical and Chemical Properties ==
Soluble in most organic solvents. Slightly soluble in water.
Composition 	CH2:C(CH3)COOCH3
CAS 	80-62-6
Melting Point 	-48 C
Density 	0.940 g/ml
Molecular Weight	mol. wt. = 100.1
Refractive Index	1.482-1.521
Boiling Point 	100-101 C
==Resources and Citations==
* R. J. Gettens, G.L. Stout, Painting Materials, A Short Encyclopaedia, Dover Publications, New York, 1966
* G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 10
* Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
* Theodore J. Reinhart, 'Glossary of Terms', Engineered Plastics, ASM International, 1988
* Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
Category:Materials database
Methyl orange, sodium salt

== Description ==
A pale, orange powder used as an acid-base 
indicator. Methyl orange is an azo dye that was discovered by several workers near the same time period: P. Griess in 1875; O.N. Witt in 1876; and Z. Roussin in 1876. As an indicator, methyl orange forms a red color below pH 3.1, turns orange above pH 4.4 and becomes yellow in alkaline solutions. It is used for titrating 
mineral acids. Methyl orange is also used for dyeing 
textiles.
[[[SliderGallery rightalign|methyl orange, sodium salt.jpg~Chemical structure]]]
== Synonyms and Related Terms ==
4-[[(4-dimethylamino)phenyl]-azo]benzenesulfonic acid sodium salt; sodium p-dimethylaminoazobenzenesulfonate; helianthine B; Acid Orange 52; CI 13025; Orange III; Gold Orange; Topaeolin D
== Risks ==
* Toxic by ingestion. 
* Inhalation and skin contact may cause irritation. 
* ThermoFisher: SDS
==Physical and Chemical Properties==
Soluble in hot water. Insoluble in ethanol.
Composition 	(CH3)2NC6H4NNC6H4SO3Na
CAS 	547-58-0
Density 	1.00 g/ml
Molecular Weight	mol. wt.=327.34
==Resources and Citations==
* The Merck Index, Susan Budavari (ed.), Merck Research Labs, Whitehouse Station, NJ, 12th Edition, 1996 Comment: entry 6180
* Colour Index International online at www.colour-index.org
* Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
* Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
Category:Materials database