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：137-09-7
中文别名：阿米酚;2,4-二氨基苯酚盐酸盐;
英文别名：2,4-Diaminophenol Dihydrochloride;2,4-Diaminophenol;2,4-diaminophenol,dihydrochloride;Phenol, 2,4-diamino-, dihydrochloride;
分子式：C6H10Cl2N2O
分子量：197.062
精确质量：196.017
Psa：72.27
Logp：3.323

EINECS号：205-279-4
BRN号：3913728
MDL号：MFCD00012979
RTECS号：SK7600000

外观与性状：绿色结晶粉末
密度：1.343 g/cm3
沸点：347.4ºC at 760 mmHg
熔点：222°C (dec.)(lit.)
闪点：163.9ºC
水溶解性：27.5 g/100 mL (15 ºC)
稳定性：Stable. Incompatible with strong oxidizing agents, acids. Heat and light sensitive.
储存条件：库房通风低温干燥
蒸汽压：2.68E-05mmHg at 25°C

RTECS号：SK7600000
安全说明：S26-S36
危险类别码：R22; R36/37/38
WGK Germany：3
海关编码：29222900
危险品运输编码：UN 2811 6.1/PG 3
危险类别：6.1
包装等级：III
危险品标志：Xi

生产方法
由2,4-二硝基苯酚还原制取 用作染发剂。
用途
用作染发剂。