This procedure bleaches out the black hairs that are commonly found in wool. It is typically necessary to perform a black hair bleaching process if white, off-white, or pastel shades are desired. This procedure requires the following chemicals:
5% owg Formic Acid
4% owg Sodium Formaldehyde Sulfoxylate
2% owg Sodium Thiosulfate
4% owg Ferrous Sulfate
5% owg Suitable Reducing Agent such as Sodium Hydrosulphite
1% owg Orco Salt O Solution™
- Enter goods into bath.
- Add Orco Salt O Solution™ first to wet out the wool stock.
- Add Formic Acid second.
- Dissolve Ferrous Sulfate in half the amount of Sodium Formaldehyde Sulfoxylate which is dissolved in hot water.
- Add Sodium Thiosulfate.
- Finally, add Suitable Reducing Agent such as Sodium Hydrosulphite.
- Bring bath to 135°F(57°C) and run for 1 ¼ hours.
- Rinse well cold.
- In fresh bath, add:
8% owg Diammonium Phosphate
13% owg Ammonia
43% owg Hydrogen Peroxide 35% volume
2% owg Orco Ferrosol F-80 Liquid™
- Bring temperature to 135°F(57°C) and run for 1-1 ½ hours depending on condition of stock.
- Rinse well.