Disazo dyestuffs

These pigments may be defined as those that will meet the exacting demands of today s environment with respect particularly to the outdoor exposure requirements demanded by climates such as those that occur in Florida and Arizona for as little as two and as long as five years. The high-performance reds considered fall into four basic classes quinacridone reds and violets, vat dyestuff reds such as perylenes, benzimidazolone reds, and disazo condensation reds. 

Benzidine yellow n. Benzidine or diarylide yellows are disazo pigment dyestuffs. They are approximately twice as strong, much more bleed and heat resistant and markedly inferior in lightfastness versus Hansa yellows. 

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