Did You Know? (Urine, Pt. 1)

The second process in preparing wool for spinning is scouring.  Wool has a natural grease, suint, that is removed by washing the wool in a warm weak alkaline solution; traditionally stale urine (which produces a solvent, ammonium hydroxide) was used.

The Primary Textile Industry In Canada – McCullough, p. 13

also

Fermented suint for cleaning fleeces – https://mozfiberlife.wordpress.com/fsm/

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