Dyeing with mineral colour

Abstract

Mineral colours are formed in situ cellulosics when water soluble metal salts are applied on fibre followed by conversion to insoluble metal oxides. No dye or pigments are applied rather colour of specific metal oxide alone or in combination shows the final hue. The metal oxides occupy free volume in fibre making it stiffer. Mineral colours are acid sensitive and less brilliant; invariably topped with vat or sulphur colours. Important member is mineral khaki for military uniforms.