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Amidol is a colorless crystalline compound with the molecular structure C₆H₃₂OH. It is a dihydrogen chloride salt and is used as a photographic developer. It was introduced as a developing agent for photographic papers in 1892. It is unusual amongst developing agents as it works most effectively in slightly acid conditions rather than the strongly alkaline conditions required for most other developers. As amidol ages it changes color to a dark red-brown. Developing dishes and equipment used to prepare amidol solutions are also frequently stained brown, a stain that is very persistent.

  • also known as Diaminophenol, 2-4-Diaminophenol hydrochloride

Printed dictionaries and other books with definitions for Amidol

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Google previewNew Photo-miniature (1902)

by John A. Tennant, Ben Jehudah Lubschez

' Developer AMIDOL is supplied in the form of fine sparkling little crystals. AMIDOL is a quick and powerful developer bringing out all details ...

Google previewThe Darkroom Cookbook (2012)

by Steve Anchell

Because amidol is an exceedingly active developing agent it is considered to be a good choice for water bath development. The technique could not be much simpler. Use the next higher grade of paper or filter than the desired final contrast ...

Google previewSnap Shots (1910)

Amidol is a particularly bad stainer. Curiously enough, it is as clean working, as far as the plate is concerned, as any developer on the market; but it seems to affect the finger nails particularly. The greasing treatment is very useful here also.

Google previewThe Photographic Times (1906)

Amidol is a very useful reagent for over-exposed plates, and where there is a lack of strength and contrast. A good snapshot developer. Eikonogen is very useful for hand cameras, and in single solutions. It can be used over again. A very good ...

Google previewPhoto-era Magazine (1905)

by Juan C. Abel, Thomas Harrison Cummings, Wilfred A. French, A. H. Beardsley

Amidol is an excellent developing agent, and acts ...

Google previewThe Photo-American (1905)

Amidol is a good developer, less likely to clog the high lights than pyro. Few things in the history of photography are more remarkable than the evolution of the hand camera. Only as recently as 1881, Mr. Thomas Bolas was describing several ...

Google previewShields' Magazine (1907)

Amidol is a useful reaeent for over exposed nlates. and where there is a lack of strength and contrast. A good snap shot developer. Eikonoeen is useful for hand cameras and in single solutions. It can be used over again. A cood formula is ...

Google previewPractical Holography, Third Edition (2003)

by Graham Saxby

Amidol is a gray powder that stains anything it touches an indelible blueblack, so be careful with it. You can also use PBQ (1 g) if you must, but give the solution 6 hours to become stable before use, and carry out all operations in a properly ...

Google previewThe Amateur Photographer and Photographic News (1908)

Amidol is a good developer also, and should be used without bromide, the time of development required for a given strength developer being found by experiment. Lancaster Photographic Society. — The annual exhibition will be held in the ...

Google previewThe Dictionary of Photography for Amateur and Professional Photographers (1902)

by Edward John Wall

Amidol (Ger., Fr., Ital., Amidol). C6H3OH(NH,)1, = 124. Synonym: Diamidophenol. The peculiar characteristic of this substance is that it will develop without ...

Google previewThe Encyclopædic Dictionary of Photography (1896)

Containing Over 2,000 References and 500 Illustrations by Walter E. Woodbury

AMIDOL. — The trade name for diamidophenol (formula, C6H8O2), molecular weight, 124). — A white crystalline powder, easily soluble in water, giving a colorless solution having an acid reaction. It was first discovered by Gauche as early as ...

Google previewA Dictionary of Chemistry (2008)

by John Daintith

amidol. See AMINOPHENOL. amination. A chemical reaction in which an amino group (–NH 2 ) is introduced into a molecule. Examplesofaminationreactionincludethereactionofhalogenated hydrocarbons with ammonia (high pressure and ...

Google previewModern Dictionary Cyto And Histo Chemistry (1991)

by C.K. Shah

Amidol solution Deposits of fine black silver indicate the sites of calcium carbonate or calcium phosphate. Sections are treated with AgNO3 (0.5%), amidol (0.5%) and aqueous 1% sodium thiosulphate. Ammoniacal silver carbonate Basic ...

Google previewThe A-Z Encyclopedia of Alcohol and Drug Abuse (2002)

by Thomas Nordegren

Amidol Dimepheptanol. Amidol acetate Acetylmethadol. Amidon Methadone hydrochloride. Amidon HCI Methadone hydrochloride. Amidon, -a, -e Methadone. Amidone Colloquial term for methadone, from Amidon, one of the original names ...

Google previewThe Focal Encyclopedia of Photography (2013)

by Michael R. Peres

Amidol, C6H3(NH2)2OH*2H2O A trade name for diamidophenol, a developing agent for silver bromide gelatin emulsions that was introduced by Dr. Anderson in 1892. Amidol made negatives grayish black, with very little fog. It was favored ...

Google previewThe Encyclopaedia Britannica ... (1902)

A Dictionary of Arts, Sciences and General Literature ... in Thirty Volumes with New American Supplement

Amidol Developer. Amidol . - - - 3 parts. Sodium sulphite . . 100 , , Potassium bromide . 1 to 3 , Water 1000 This developer requires no addition of alkali. Ortol Developer. Solution A. Ortol ...

Google previewA dictionary of applied chemistry (1913)

by Sir Thomas Edward Thorpe

Amidol Sodium carbonate „ sulphite Potassium carbonate ,, bromide Water 60 grs. 4 oz. 2 oz.

Google previewIllustrated Dictionary of Photography (2008)

The Professional's Guide to Terms and Techniques for Film and Digital Imaging by Barbara A Lynch-Johnt, Michelle Perkins


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Scrabble value of A1M3I1D2O1L1

The value of this 6-letter word is 9 points. It is included in the first and second editions of the Official Scrabble Players Dictionary.

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