skimming
The process of removing film from the surface of
marbling size. The film results from evaporation
and must be removed before the colors are placed
on the size, otherwise they will not expand
properly. It must be done quickly and the colors
dropped on immediately so as to prevent another
film from forming. Skimming may be done with a
skimmer, a device attached to the marbling trough,
and which is raised and lowered on both ends,
according to the quantity of size in the trough.
The rubber blade which skins the size allows for a
clean skim, and, being supported on the rim of the
trough, assures an even and quick pull which does
not disturb the size. (264 )
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