Sanchi Chemicals Pvt. Ltd manufactures Metal Complex Dyes for Wood Stains. Sanchi Chemicals Pvt. Ltd ISO is 9001: 2000 & 14001: 2004 certified company that TPM Dyes, acid blue 9, solvent dyes, metal complex dyes, leather dyes, optical brightening agents and more. Metal Complex Dyes are widely used in wood stains, scalding and coating, aluminum metal foil and plastic spraying and all sorts of house decorations. The metal complex acid dyes come with the highest light fastness and wet fastness. These dyes are also very economical. They produce, however, duller shades.