If the soaking is too long continued in water
that is much discolored by the sensitizing preparation, the sheets
become saturated with the diluted preparation, and they may become
slightly colored by _after_ exposure. If the first soaking is not too
long continued, and if the sheets are transferred at once to a second
bath of clean water, which is kept slowly changing from an open faucet,
they may remain there until the soluble chemicals have been entirely
extracted, and there will be no risk of staining by after exposure.
Washing in two tanks is of more consequence when the ground is white and
the lines blue, than when the ground is blue and the lines white.
_The Grades of Paper that are well Adapted for Blue Process Work._--I
have tested many grades of paper, to ascertain if they were well adapted
for blue process work. Some grades of brown Manila are very good; others
have little specks embedded in their surfaces which refuse to take on a
blue tint; still others, when printed upon, have white lines that are
wider than the corresponding black lines of the negative. The blue
obtained upon bond paper appears to be particularly rich, and the whites
remain pure; but bond paper cockles badly, and the cockles remain in the
finished print. Weston's linen record is an excellent paper. It is
strong, cockles but little, and dries very smooth. A paper that is used
by Allen & Rowell, for carbon printing, is comparatively cheap, and is
an excellent paper.
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