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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™

  1. Enter goods into bath.
  2. Add Orco Salt O Solution™ first to wet out the wool stock.
  3. Add Formic Acid second.
  4. Dissolve Ferrous Sulfate in half the amount of Sodium Formaldehyde Sulfoxylate which is dissolved in hot water.
  5. Add Sodium Thiosulfate.
  6. Finally, add Suitable Reducing Agent such as Sodium Hydrosulphite.
  7. Bring bath to 135°F(57°C) and run for 1 ¼ hours.
  8. Rinse well cold.
  9. In fresh bath, add:
    8% owg          Diammonium Phosphate
    13% owg         Ammonia
    43% owg         Hydrogen Peroxide 35% volume
    2% owg          Orco Ferrosol F-80 Liquid™
  10. Bring temperature to 135°F(57°C) and run for 1-1 ½ hours depending on condition of stock.
  11. Rinse well.

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