Page 84 - The Wellington photographic handbook

Little experience, however, is required to make clear how much light
the paper can stand without risk. The best plan is to fill the
printing frame and do the developing as near the light as is con-
venient, interposing a sheet of cardboard or some other opaque
screen in order to intercept its direct rays. No other precaution
whatever is necessary.
WELLINGTON S.C.P. can be printed by daylight, and
provided the light is sufficiently subdued, can also be handled in
daylight, but this latter is certainly not to be recommended, as
there is great risk of light-fog resulting. The speed of printing
is such that artificial light can be used very conveniently, and
such light being quite uniform, there is little danger of making
errors in exposure. Indeed, the latitude of exposure with
WELLINGTON S.C.P. is so great that if artificial light is
used for printing, there is no need for a single print to be spoilt.
If daylight is employed for printing, the room should have
"
the window covered with yellow fabric (or canary medium," as
it is called), one thickness being sufficient. There should be a
small space in the window, closed by an opaque shutter, which
can be opened and shut quickly, as in the sketch below.

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