Sulphur Brown 4

Preparation

coarse Cresol or m-Cresol and Sodium polysulfide in 270 ~ 275 ℃ calcination, add or do not add Copper sulfate monohydrate all can.

Properties and Applications

brown light olive to yellow brown. Brown hydroscopicity powder. There are dark brown in hydrochloric acid precipitation; In concentrated Sodium hydroxide solution for blue light green. Used for cotton, hemp, viscose and vinylon/cotton blended fabric dyeing, and sometimes also used in leather dyeing.

Standard	Acid Resistance	Alkali Resistance	Light Fastness	Fulling	Persperation Fastness	Soaping
						Moderate	Severe
ISO	4	3	3-4	4-5		4	3-4