This procedure bleaches out the black hairs that are commonly found in wool without the generation of a sulfurous odor.  It is typically necessary to perform a black hair bleaching process if white, off-white, or pastel shades are desired.

1. Enter prewet goods* into bath containing:
   1. 6  g/L   Ferrous Sulfate
   2. 4  g/L  Orco Bleach Assist ASC™
   3. X g/L   Formic Acid to pH of 3 if necessary

1. Set bath at 110°F(43°C) and circulate for 15 minutes.
2. Slowly raise temperature to 175°F(80°C) and hold for 60 minutes.
3. Drop bath and rinse at 175°F(80°C) for 20 minutes.
4. Cold rinse at 70-80°F(21-27°C) for 20 minutes.
5. Drop bath and refill.
6. Enter goods into fresh bath containing:

10 g/L              Tetrasodium Pyrophosphate(TSPP)

10 ml/L            Hydrogen Peroxide 35%

X  ml/L            Ammonia if needed to pH of 8-8.5

1. Raise temperature to 175°F(80°C) and hold for 60 minutes.
2. Re-acidify if necessary with either acidic or citric acid.

Note:   If an overall lighter effect is required, repeat steps 7-9.

*  Prewetting is recommended with 2-2.5% owg Orconol CHSA Conc™ in a separate bath or may be added directly to the first bath in step 1.

 

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