Direct Black 19 

Product Name: Direct Black 19  (35255) Other Name: Direcr fast black G CAS No.:6428-31-5 MF: C34H27N13Na2O7S2 MW: 839.77062 Origin: China Type:Direct Dye Usage: Used for dyeing Coton ,linen,viscose ,Paper,Silk ,Fiber,ect Direct black is one of the direct dyes which is the dyestuff and can be applied in many fields.  Qingdao Langke Co., Ltd is one of the main supplier of pigment,dyestuff  and their intermediates. In the past 10 years, we have sold the products to more than 20 countries. Either acid dyes or direct dyes, or even pigment, they all gained good reputation. To choose us as the partner, you will not be disappointed.