... : DSD ACID Chemical name : 4,4'aaDiaminostilbeneaa2,2'aaDisulfonic acid Dyes intermediates Purity :above 95 % 1,Chemical name : 4,4'– ... Light yellow paste or powder , soluble in alcohol and ether ,Insoluble in water. (b)Easy to be oxidized red in air ... to customer's specifications.8,Uses:Dyes intermediates to produce Fluorescent whitener , paper ,direct dyes.Reative dyes and used as insecticide ect .9 ...