Chemical Properties
7,70 -Iminobis(4-hydroxynaphthalene-2-sulfonic acid) [87-03-6] J acid imide, di-J acid, is produced by heating the sodium salt of J acid in aqueous sodium bisulfite at 106℃ for 36 h (yield 89 %). It is used to produce C.I. Direct Reds 31 and 149, as well as C.I. Direct Violets 48, 66, and 102.
Uses
Rhoduline acid is an acidic compound that can be used for the synthesis of azo dyes[1].
Flammability and Explosibility
Not classified
References
[1] Shirasaki et al, Bisazo compounds and their use for dyeing fibers, German, DE3403326A1, 1984-08-09.