Hydrolysis of Reactive dyes

Under alkaline condition, Reactive dyes react with the terminal hydroxyl group of cellulose. But if the solution of the dye is kept for long time, its concentration drops. Then the dye reacts with the hydroxyl group of water. The reaction of dye with water is called hydrolysis of reactive dye.

Hydrolysis increases with:

1. High temperature.
2. High pH.
3. Longer liquor ratio.
4. Longer dyeing time.