Black Sulphur Powder, For Mainly Used Dyeing On Cotton, Purity : 94%Min

Appearance : Bright-black flake or grain, it is the green-black colour when it soluble in solution of sodium sulfide.

Properties : Black grain powder, soluble in water. It is black with green bright when soluble in sulfuric alkali solution, and it becomes black when coming into contact with dense sulfuric and and with sulfur dioxide released. It produces Precipitate after diluting.

Usage : Mainly used for dyeing and winding dyeing on cotton, jute, viscose, polyvinyl alcohol fibre and polyester, polyamide fibre, specially used for rolling dyeing. It is uniform and stable in colour, good permeability when dyeing without any fragile treatment. It is also used for dyeing on leather and original visccose fibre.

Sulphur dyes

• The first Sulphur dye was discovered in France in 1873, & further work done by Raymond Videl enabled the manufacture of 'Videl black".

• Its outstanding fastness to light, washing & boiling far surpassed any cotton black known at that time.

• The general disadvantage of the Sulphur dyes that they produce dull shades & lack a red.

Sulphur dyes – Uses :

• The use of Sulphur dyes is restricted to dull brown, Khaki & Navy shades, where a good wash but not boil-fastness is required.

• Most Khaki & Navy overalls are dyed with Sulphur dyes.

• An outstanding member of this family is Sulphur black.

• It dyes all cellulose fibers, but particularly linen & jute, to a lustrous & deep black with excellent wash & light fastness.

• Sulphur dyes are dyed from a dye bath containing Sodium Sulphide & common or Glaubers Salt, & are oxidized by airing or with some oxidizing agents (Sodium Dichromate or Hydrogen Peroxide) in a fresh bath.

Main Properties of the Sulfur Dyes

• Economical dyeing with excellent tinctorial value and good build up properties.

• Good overall colorfastness properties such as wash fastness light fastness, perspiration fastness etc. Moderate fastness to crocking and poor fastness to chlorines bleaching agents such as bleaching powder and sodium hypochlorite.

• Limited shade range to produce only dull shades and there is no true red dye in the range.

• These dyes can be applied by exhaust, semi continuous or continuous dyeing methods on garment, yarn, knits, fabric as well as loose stock etc

Types of Sulfur Dyes :There are three classes of sulfur dyes, which are available commercially,

• Conventional water insoluble dyes which have no substantively to cellulosics.

• Solubilised sulfur dyes, which are water soluble and non-substantive to cellulosics.

• Pre-reduced sulfur dyes, in the stabilized leuco compound form, which are substantive to cellulosics