clearing
The process of lightening the color and removing
metallic stains from the grain surface of newly
tanned leather. Clearing is done by drumming the
leather in a cold solution of weak acid, e.g.,
a.25 or 1% solution of oxalic (H 2 C
2 O 4 ) or sulfuric (H
2 SO 4 ) acid; if heavy STRIPPING (1) or
clearing is required, or if the original tannage
was not satisfactory for the leather required, it
is not uncommon to retan the leather at this time.
(306 )
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