Page 110 - The Wellington photographic handbook

toning the result. A quarter-plate or smaller negative can in this
way provide a striking picture 24 X 18 or even larger.
It is important when using bolting silk, to have the separation
between the bromide paper and the silk uniform over the whole
enlargement. If it is not, the character of the definition will
alter unpleasantly in different parts. For this reason, it is best
to stretch the silk on a sheet of glass. If no separation is required,
it is then pressed down on the bromide paper and secured with
dark-room pins. If a slight separation is required, it is turned
so that the glass side is in contact with the bromide paper and
fastened as before.
CHIFFON IN ENLARGING.
Chiffon can also be employed for creating diffusion in enlarge-
ments. All that is necessary is to place one, two or three thick-
nesses of the material, according to the degree of diffusion required,
over the enlarging lens. There is a distinct advantage in using
chiffon in preference to bolting silk, as all that is required is a
small piece sufficient to cover the lens and allow a margin of an
inch or two, which is placed over the lens mount and held in position
by an elastic band. Fixed in this way, the same piece of chiffon
can be used for all sizes of enlargements. With bolting silk, the
piece used must be sufficient to cover the biggest enlargement to
be made and if large sizes are being dealt with, this becomes some-
what unwieldy.
The enlarged image should be focussed sharply on the enlarging
easel and the chiffon then placed in position as described above.
It will be found that the use of diffusing material necessitates an
increase in the exposure, but not sufficient to cause any incon-
venience in working.
The subsequent operations in enlarging are the same as for
contact prints.
DIRECT ENLARGING ON S.C.P.
While the greater sensitiveness of WELLINGTON Bromide
and B.B. paper over S.C.P. makes them more extensively used for
enlarging, it must not be supposed that enlargements cannot be
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