Sulphur Black Sulphur Black Liquid Characteristics: Lustrous Grains, imparts full black shade with a slight reddish or greenish tone according to the requirement. This dye belongs to the group of Sulphur Dyes. It is mainly used for dyeing Cellulosic fiber. It is also useful for dyeing viscose, staple fiber and yarn, including material which is to given a resin finish, Silk, package dyeing and for continuous process. The light fastness of Sulphur Black is very good. Hue. Artificial Light (tungsten) Greenish Black to Bluish Black.