May 23, 2010 at 6am to May 31, 2010 at 7pm – Bio factory, Sp Road, Trivellore, South India. Hello consious producers of natural dyes. Tannin is fixing agent for all natural dyes on organic fibres. In some source materials this natural chemical compound is missing. But people wage wars… Organized by N.J.Bond | Type: celebrating, tannin, natural, dye, material, sources, invention.