Sodium sulphate. Used as a LEVELLER in both synthetic and natural dyeing. Glauber's salt slows down the colour uptake of the dye, encouraging more even and level strike. This is particularly useful when dyeing soft pastel shades. TO USE: Calculate amount required for 10 to 50% WOF (weight of fibre), lower amounts for softer shades, higher amounts for deeper colours. Dissolve in hot water and add in stages during dyeing, as the bath temperature rises but before dye strikes. Dispose of spent dyebath in your usual way. Down the drain is fine. CAUTION: wear a mask when handling powders.