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Its value may be increased by addition of weak vitriol, which exercises a decomposing action on the nitrogenous matter, forming with it sulphate of ammonia. The original residue from the filter-press, if it does not contain indigo, may be at once put to similar use. In large works, which dye their own goods, it is well known that the "fermentation vat" is in general use for indigo-dyeing.
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