... name : 4,4'aaDiaminostilbeneaa2,2'aaDisulfonic acid Dyes intermediates Purity :above 95 % 1,Chemical name : 4,4'– ... red in air .There is similar properties with aromatic acid and amine .7,Specifications : ItemMoist productsDry productsAppearanceLight yellow ... be manufactured according to customer's specifications.8,Uses:Dyes intermediates to produce Fluorescent whitener , paper ,direct dyes.Reative ...