Amidol


Amidol
Amidol[1]
Identifiers
CAS number 95-86-3
[137-09-7] (dihydrochloride)
PubChem 7266
ChemSpider 6996 YesY
UNII NNB4I01PA7 YesY
Jmol-3D images Image 1
Image 2
Properties
Molecular formula C6H8N2O
Molar mass 124.14 g/mol
Appearance Colorless solid
Melting point

78-80 °C

 YesY (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Amidol is a colorless crystalline compound with the molecular structure C6H3(NH2)2OH. 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.

Prints developed in amidol are typically a very warm brown-black colour, but overdevelopment can quickly lead to chemical fogging.

References

  1. ^ Merck Index, 11th Edition, 2961.

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Look at other dictionaries:

  • amidol — AMIDÓL s.n. Substanţă organică folosită ca developator în fotografie. – Din fr. amidol. Trimis de ana zecheru, 13.09.2007. Sursa: DEX 98  amidól s. n. Trimis de siveco, 10.08.2004. Sursa: Dicţionar ortografic  AMIDÓL n. Substanţă folosită în… …   Dicționar Român

  • Amidol — Am i*dol, n. [Amide + ol as in alcohol.] (Photog. & Chem.) A salt of a diamino phenol, {C6H3(OH)(NH2)2}, used as a developer. [Webster 1913 Suppl.] …   The Collaborative International Dictionary of English

  • Amidōl — Amidōl, s. Diamidophenole …   Meyers Großes Konversations-Lexikon

  • Amidol — Amidōl, Diamidophenolchlorhydrat, photogr. Entwickler …   Kleines Konversations-Lexikon

  • amidol — [amidɔl] n. m. ÉTYM. D. i.; du rad. de amidon (dans les noms de ses comp. chimiques), et suff. ol. ❖ ♦ Chim. Chlorhydrate de diamidophénol, utilisé en photographie comme réducteur …   Encyclopédie Universelle

  • amidol — s. m. Cloridrato de diamidofenol usado na fotografia …   Dicionário da Língua Portuguesa

  • amidol — [am′i dōl΄, am′idôl΄, am′idäl΄] n. [Ger, orig. trademark < amido , AMIDO + phenol, PHENOL] a colorless crystalline compound, C6H3 (NH2) 2OH·2HCl, used as a developer in photography …   English World dictionary

  • Amidol® — /amˈi dol/ noun A colourless chemical (C6H3(NH2)2(OH).2HCl) used as a photographic developer …   Useful english dictionary

  • amidol — amidolis statusas T sritis chemija formulė C₆H₃(NH₂)₂OH atitikmenys: angl. amidol rus. амидол ryšiai: sinonimas – 2,4 diaminofenolis …   Chemijos terminų aiškinamasis žodynas

  • amidol — ˈaməˌdȯl, ōl noun ( s) Etymology: German, from Amidol, a trademark : a colorless crystalline salt C6H3(NH2)2OH.2HCl used chiefly as a photographic developer; the dihydrochloride of 2,4 diamino phenol …   Useful english dictionary