Meaning of nigre | Babel Free

Definitions

In soapmaking, the lower layer of liquid produced by pitching, which contains most of the impurities.

Examples

“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.”

CEFR level