Catechu Brown
The wool is boiled for 1 to 1-1/2 hours, with 10 to 20 per cent
catechu, then sadden with 2 to 4 per cent of copper sulphate, ferrous
sulphate, or chrome, at 100 deg.C., in a separate bath for 1/2 hour.
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Alder Bark
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Light Grey
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