photocopying paper
A base paper of superior quality that is coated
with a fast light-sensitive emulsion for use in
photocopying machines, and also for designs and
layouts. The paper is produced from pulps ranging
from 100% cotton fiber to 100% chemical wood
pulps, the latter being generally of papermaking
alpha grade. The pulp must be highly purified as
all metallic residues must be removed. The paper
is also given wet strength treatment to enable it
to withstand the acids and alkalis and other
photographic solutions used in photographic
processes. Inertness to photographic sensitizing
solutions is important, as are uniformity of color
and surface. The base paper is finished with
gelatin sizing so as to prevent the photographic
emulsion coating from penetrating too deeply into
the sheets. (17 )
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