Liquid Sulphur Black is extensively used for Denim yarn dyeing either by warp sheet (Slasher dyeing) or Rope dyeing system for obtaining. It is a popular practice for coloring cotton yarn in handloom sector and in this approach; the spent dye bath is being replenished for subsequent dyeing. Sulphur black is an excellent dyes for the use of cotton with its high performance and cheaper price, it has been playing an important role in gradually acute market competition since it has born one hundred years ago. Dalian Dyestuffs & Chemicals Corporation had produced sulphur black for more than eighty years, the production capability is 12000 tons per years.