BARNET BOOK OF PHOTOGRAPHY.
248
may be commenced,
slowly, a second set of prints
opaque paper withdrawn
the actinometer read from the second
the thin
put out, and
at the time these are half.
DRAWING AND ETCHING PAPERS FOR SINGLE TRANSFER. and
White
toned
drawing
and
etching
papers
of
smooth and rough surfaces are obtainable prepared for receiving prints by single transfer, in the same manner as previously described for the thin ordinary single
transfer
paper.
There are
slight differences
in working,
and
extra pre-
cautions are necessary to avoid failures and defects, their use involves
no
special difficulty.
In order to retain the
effect of the surface of the
in the finished print, the gelatine coating
kept so
much on
Should any is
the surface as in the
difficulty
but
is
thin,
paper
and not
ordinary paper.
be experienced in determining which
the prepared surface, the paper should be held obliquely
to the light,
and the prepared
glossy, while the
back
will
face will appear very slightly
be absolutely
dull.
Prints finished on these papers will have just sufficient
glaze in the all
shadows
to assist detail
and give depth, while
the lighter tones remain perfectly matt
;
and they
retain
the texture of the paper admirably.
Much
longer soaking of these papers
is
necessary before
squeegeeing the exposed prints into contact, from forty-five
fifteen to
minutes according to the thickness and roughness
of the paper, but longer will not injure
them nor
affect the
after working.
In squeegeeing, greater pressure must be used than
is
necessary with the thin smooth papers in order to ensure that the tissue shall be
throughout.
in
good contact with the paper