Washing Agent, Washing Soda, Washing Fastness

WETTING AGENT:-
A CHEMICAL THAT HELPS WATER PENETRATE A MATERIAL OR FORM A FILM OVER ITS SURFACE; USUALLY A SURFACTANT; WETTING AGENTS ARE OFTEN USED IN DYEING TO HELP THE DYE SOLUTION PENETRATE TO THE INDIVIDUAL FIBRES (THEY DON'T USUALLY HELP THE DYE PENETRATE FROM THE SURFACE OF THE FIBRE TO THE INTERIOR OF THE FIBRE.

WASHING SODA:-
IF "PURE" IS USUALLY SODIUM CARBONATE DECAHYDRATE; RETAIL WASHING SODA MAY CONTAIN ADDITIVES SUCH AS DETERGENTS, SALT AND OPTICAL BRIGHTENERS, AND IS THEREFORE NOT A GOOD SUBSITITUTE FOR SODA ASH FOR DYEING.

WASH FASTNESS:-
A MEASURE OF THE RESISTANCE OF A DYE TO WASHING OUT OF THE FIBRE; THERE ARE NUMBER OF INDUSTRY-STANDARD TESTS FOR WASH FASTNESS, USUALLY BASED ON THE EQUIVALENT TO THE HOME LAUNDYR PROCESS APPROPRIATE FOR THE FIBRE; WASH FASTNESS ARE CONCERNED NOT ONLY WITH LOSS OF DYE FROM THE COLOURED FABRIC; BUT ALSO TRANSFER OF DYE FROM THE WASH LIQUOR TO OTHER ITEMS; WASH FASTESS DEPENDS TO A GREAT EXTENT ON THE NATURE OF THE DYE, BUT ALSO ON THE FIBRE, THE APPLICATION PROCESS AND THE POST DYEING TREATMENT; THERE IS NOT NECESSARILY ANY RELATIONSHIP BETWEEN WASH FASTNESS AND LIGHT FASTNESS.