They offer good colour value at a reasonable cost, good washing fastness and there is no other black dye for cellulose that can compete with the attractive deep shade produced with C.I. Sulphur Black 1. They can be solubilised with alkaline reducing agents, usually sodium sulphides. Once soluble they are substantive to cellulosics. When they have penetrated the fibre, they are converted back to their original insoluble form by oxidation. 

Apsul Black 2RF

Apsul Black 2RF pre-reduced sulphur dye for dyeing denim and cellulosics. IMO, GOTS approved, Global Organic Textile Standard approved.


Apsul Black B4G Liq

Apsul Black B4G liquid pre-reduced sulphur dye for dyeing denim and cellulosics.


Apsul Black BF

Apsul Black BF pre-reduced sulphur dye for dyeing denim and cellulosics.


Apsul Black R F-ML

Apsul Black RF-ML pre-reduced sulphur dye for dyeing denim and cellulosics. IMO, GOTS approved, Global Organic Textile Standard approved.


Apsul Black RF

Apsul Black RF pre-reduced sulphur dye for dyeing denim and cellulosics. IMO, GOTS approved, Global Organic Textile Standard approved.


Sulphur Black BR 200%

C.I. Sulphur Black 1, Sulphur Black BR 200% for Textile Dyeing