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Physical & Chemical properties

Appearance / physical state / colour

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Description of key information

4-aminoazobenzene-3,4'-disulphonic acid was appeared to be Organic powder solid. 

Key value for chemical safety assessment

Physical state at 20°C and 1013 hPa:
solid

Additional information

In a National Center for Biotechnology Information, U.S. National Library of Medicine report (2016), mentioned that the 4-aminoazobenzene-3,4'-disulphonic acid was appeared to be Organic powder solid.

In a Center for Chemical Hazard Assessment, Syracuse Research Corporation report (1981), mentioned that the4-aminoazobenzene-3,4'-disulphonic acid wasappearedto be Organic solid in needles form with dark violet colour.  

Hence, on the basis of above available data,4-aminoazobenzene-3,4'-disulphonic acid was appeared to be needles or powder organic solid with dark violet colour.