nigre


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Related to nigre: nitre, Niger, Negress

nigre

[′nī·gər]
(chemical engineering)
Dark-colored layer formed between neat soap and lye during soap manufacture; contains more soap than lye, and a high concentration of salts and colored impurities.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.