Methylene blue 2B Certificate: ISO9001:2000,ISO14000:2004.Market in Southeast Asia, America and Europe.Used in textile industry Methylene blue 2BUsed in textile industry, such as silk, wool, cotton, leather, paper, bamboo and so on. DALIAN RICHON CHEM CO. LTD. TEL:+86 411 82507336,82507337,82507338 FAX:+86 411 82507318 Methylene blue 2B