RIT ProLine Powder Dye in Dark Brown is a professional, all-purpose powdered dye made for high-volume fabric and material dyeing. The advanced mix of direct, acid and disperse dyes works on many fibres including cotton, linen, silk, wool, nylon and polyester blends; one 454 g (1 lb) jar can dye up to 7.3 kg (16 lb) or about 44 m (48 yd) of fabric. Use washing machine or bucket methods for natural fibres, and choose the stovetop method for synthetics; the formula is non-toxic and septic-safe.