Kepra Industries manufactures Eco-Friendly Oxidant for Sulphur and Vat Dyes. Kepra Industries manufactures and supplies guar gum powder and its derivatives for food grade and industrial grade, textile printing thickener kepragum LS/70 and sodium metanitro benzene sulphonate 95% min. Powder [Resist Salt]. The Eco-Friendly Oxidant for Sulphur and Vat Dyes is an effective oxidizing agent capable of oxidizing all sulphur and vat dyes from the leuco to the insoluble state when applied to cellulose containing fibre in all forms. Full consistent, repeatable shade development occurs with excellent fastness properties.