scouring
1. The process of removing the sediment of tannin
particles which become fixed in the grain of the
skin following a prolonged tannage. The machine
used in scouring is similar to the regular
unhairing or fleshing machine, except that the
cylinder has carborundum cemented in place in lieu
of blades. The speed of the machine is also much
slower. See also:SCUDDING , 2. The
removal of surplus oil from an oil-tanned leather,
e.g., CHAMOIS (2)
, by washing in water and a 2 to 4o solution (by
weight of the skins) of soda ash. (306 )
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