nigre

A layer of darker weak soap, termed "nigre," which on an average tests 33 per cent. fatty acids, and, according to the particular fit employed, will amount to from 15-20 per cent. of the total quantity of soap in the pan.

The Handbook of Soap Manufacture H. A. Appleton

"nigre" is a weak solution of soap together with any excess of alkali

The Handbook of Soap Manufacture H. A. Appleton

The thin crust or layer at the top of the pan is gently removed, and the soap may be either ladled out and conveyed to the frames, or withdrawn by the aid of a pump from above the nigre through a skimmer

The Handbook of Soap Manufacture H. A. Appleton

The amount of the layer is very variable, and doubtless, under certain physical conditions, this liquor has separated from the nigre.

The Handbook of Soap Manufacture H. A. Appleton

The colour of the nigre will determine the number of times it can be employed.

The Handbook of Soap Manufacture H. A. Appleton

The quantity of nigre may vary not only with the amount of water added during finishing, but is also influenced by the amount of caustic alkali remaining in the soap paste prior to fitting.

The Handbook of Soap Manufacture H. A. Appleton

Some makers, however, fit the soap coarsely and allow a nigre to deposit; then, after removing the nigre, or transferring the settled soap to another copper, containing scraps of mottled soap, get the soap into a condition for mottling, and add the silicate of soda solution.

The Handbook of Soap Manufacture H. A. Appleton

The settled portion may be incorporated with a new charging to keep the resultant soap uniform in colour -- unless this is done, the difference in colour between boils from new materials alone, and those containing nigre, is very noticeable.

The Handbook of Soap Manufacture H. A. Appleton

Ili ne volis gxeni la nigre vestitan virinon, kiu sencxese, kvazaux senspirite, la funebrajn cxambrojn trapasxis; de frua mateno gxis malfrua vespero, en pensojn profundigxinta, sxi travagis la logxejon, senripoze kiel la pendolo de l'horlogxo, kvazaux sxi eterne iun aux ion sercxus.

The Esperanto Teacher A Simple Course for Non-Grammarians Helen Fryer

The nigre settled from this fitted nigre boil would be utilised in brown soap.

The Handbook of Soap Manufacture H. A. Appleton