To dye the given cotton material using vat dyestuff with the required percentage of dye.
The given cotton material is weighted accurately. The dye bath is prepared by pasting the dyestuff with Turkey red oil, sodium hydroxide, sodium hydro sulphite and water. The dye bath is heated for 15 minutes at 50o c for complete vatting. The material is then steeped in the dye solution. Sodium chloride is added in two portions and dyeing carried for 60 minutes at 60o c. Then it is squeezed and subjected for air oxidation, soaping and washing with cold water and it is dried.
The given cotton sample material was dyed with vat dye.