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See also: Nigre
nigre (plural nigres)
- In soapmaking, the lower layer of liquid produced by pitching, which contains most of the impurities.
- 1906, Leebert Lloyd Lamborn, Modern Soaps, Candles and Glycerin: A Practical Manual of Modern Methods of Utilization of Fats and Oils in the Manufacture of Soap and Candles, and of the Recovery of Glycerin:
- The conveyance of soap to the crutchers from the kettle may be by pump or by gravity. In the latter case, which is simpler and involves less trouble, the top level of the crutchers should be below that of the nigre.