Vat dyes

The word vat means, ‘Vessel’. The dyes take their name from vatting. The vat dyes are naturally coloring matter and kept in wooden vat and make solubilise vat dyes by the process of formantation – so it is called vat dyes.

Stages in dying with vat dyes:

(i)    Vatting

(ii) Dying

(iii) Oxidation