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Suint, swint, n. the natural grease of wool.

The "yolk" or "suint" of wool, originating from the perspiration of the animal, has long been a source of crude potash.

All unwashed wool contains a fatty or greasy matter called yolk or suint.

The washing of wool is in the main a mechanical process, in which the water dissolves out the suint while the soap emulsifies the yolk and thus removes it from the fibre.

The wool suint consists largely of the potash soaps of oleic and stearic acids.