Sulphur Black Dye

Abstract

The commercial importance of sulphur black dye is due to its ease of manufacturing. Dye belongs to the group of sulphur dyes. It is soluble in hot aqueous solution of sodium sulphide and the solution is having high degree of properties than many other cotton dyes available in the market. The main drawback of this dye is poor fastness to chlorine. The fastness of dye can be increased by using melamine for formaldehyde resin which forms chloramines derivative with chlorine, sulphur dye has a tendency to develop sulphuric acid on storage. It is suggested to use airtight vessel for strange and cool dry condition is very essential. This dye cannot be stored for a very long time since deterioration is likely to occur.