1.4,4'-Diaminostilbene-2,2'-Disulfonic acid 2. Dyes intermediates for Fluorescent Brightener 3. Manufacturer 1,Chemical name : 4,4'– ... be manufactured according to customer's specifications.8,Uses:Dyes intermediates to produce Fluorescent whitener , paper ,direct dyes.Reative dyes and ... or at customer's option . DSD ACID / for Fluorescent Brightener Intermediates