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.

CAS：95-86-3
中文别名：
英文别名：2,4-diaminophenol;Phenol, 2,4-diamino-;
分子式：C6H8N2O
分子量：124.141
精确质量：124.064
Psa：72.27
Logp：1.719

UNII：H691WBT7OS

密度：1.343g/cm3
沸点：347.4ºC at 760mmHg
熔点：205ºC
闪点：163.9ºC
折射率：1.722

海关编码：2922299090