Bleaching and Optical Brightening of Silk

This is as per a brochure from CSTRI ( Central Silk Board)

Bleaching Receipe

M:L- 1:30
Soda Ash- 0.5 GPL or 1% on the weight of the material.
Sodium Silicate- 1.5 GPL
Hydrogen Peroxide- 20 MI/Lit
Temperature- 80 deg C, Time- 60 to 90 Min, pH-9

Procedure
-Take required quantity of water.
-Dissolve soda ash and sodium silicate
- Enter the material at 40 deg C
- Work for 5 min.
- Take out the material and add Hydrogen Peroxide
- Raise the temperature to 80 deg C
-Work for 60-90 min followed by cold wash.
- Removal of excess water by using hydro extractor.

Optical Whitening Receipe

M:L- 1:30
Ranipal WHN-3% on the weight of the material
Hydrose- 2 GPL
Temperature- 60-70 Deg C, Time-15 min, pH-9

Procedure

- Take required quantity of water.
- Add Ranipal WHN and hydrose ( Dissolve Ranipal in hot water)
- Enter the material at 40 deg C.
- Raise the temperature to 60-70 deg C
- Work for 15 minutes followed by cold wash.
- Removal of excess water by using hydro extractor.
- Drying under shade.

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