How to Strip Direct Dyes from Cellulosics
For good that have been after-fixed, first remove the fixative by treating the material with 0.1% on weight of goods(owg) Hydrochloric Acid solution. Hold for 30 minutes, rinse, and neutralize with soda Ash.
Partial Stripping
- Boil good for 20 minutes in a bath containing:
0.133 oz/gal(1.0 g/L) Sodium Carbonate
0.5-1.0 % owg Orcoterge ALK-N Conc™
- Cool to 120°F(49°C)
- Overflow rinse until clear and drop bath.
Complete Stripping
- Prepare bath containing:
0.07-0.133 oz/gal(0.5-1.0 g/L Sodium Chlorite
0.133- oz/gal(1 g/L) Formic Acid 85%
- Run for 30-45 minutes at 185°F(85°C)
- Overflow rinse until clear and drop bath.