Page 138 - The Wellington photographic handbook

THE BROMIDE PRINT FOR BROMOIL.

In theory any bromide paper may be used for brorrioil, but it
will be found in practice that the recently introduced WELLING-
TON BROMOIL PAPER offers advantages over all others. Wel-
lington Bromoil Paper is made in two grades
:
White Smooth (Double weight.)
Cream Rough
( „ „ )
The bromide print should be developed with amidol or
M.Q. developer, and should be a good, clean, fully developed
print, with plenty of half-tones and without clogged shadows.
Before attempting the Bromoil Process the reader should
fully master the art of bromide printing, which is described on
pages 42 to 52.
The first essential is a good bromide print upon which to
work, the bromoil process, as mentioned above, being founded on a
combination of bromide printing and the oil-pigment process.
In brief, the silver image of the bromide print or enlargement
is replaced in the finished result by actual oil pigment, which
incidentally renders the process an extremely permanent one.
To achieve this, a certain chemical action must be employed,
as it would be obviously impossible to convert the image of the
bromide picture into a bromoil by simply dabbing oil pigment
on the surface of the print. If this were done, the result would
be merely to smudge the pigment or " ink," as it is called, all over
the surface equally, until the original picture was entirely covered
up. To enable the oil pigment to " take " in the right places on
the print—that is, where the shadows and half-tones are—it is
necessary that the surface of the print should be rendered of such
a character as to be receptive of oily substances in these parts
only and in due proportion, whilst the high-lights of the subject
must be so prepared as to resist the application of the pigment.
A RELIABLE BROMOIL BLEACHER.
To bring this about, it is first of all necessary to bleach the
bromide print in much the same way that is adopted when sulphide
toning ; but other chemicals are employed, and the success of the
Many
operation depends largsly upon the efficacy of this bleacher.
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