产品信息直接黑 38 direct black 38;chlorazol black;chlorazole black e;azo black;cotton black e extra;direct black ms,rl,gx;direct deep black ew extra;erie black gxoo,b,bf;renol black g extra;pontamine black e,ex;benzene azo-3,6-disulfo-8-amino-1-naphthol-7-azo-diphenyl azo-m-phenylenediamine sodium salt