Camera Work: A Photographic Quarterly (1905 (Heft 11))

removed and the development takes place in a similar manner to carbon-
printing.
In Great Britain and neighboring countries, where postal delivery does
not take longer than a day or two, the paper is supplied ready sensitized, but
in America and the British Colonies it becomes necessary that the worker
should sensitize the paper.
This is not at all a difficult operation and I have not yet come across a
worker who has not succeeded after a trial or two.
The paper dries in about ten to fifteen minutes and is ready for
exposure as soon as dry.
Two varieties of paper, specially sized for the process, of smooth and
medium rough quality are on sale in America, but some workers might
prefer to print on the paper of their choice. This is an easy matter when
ordinary drawing-papers are being used, but for fine, delicate work the
specially sized F paper should be procured.
Sizing. — For sizing drawing-papers either gelatine or starch may be
employed.
The gelatine solution may be made up as follows:
Water.5 ounces
Gelatine.1 dram
Methylated Spirit.1 ounce fluid
Dissolve, of course, in an outer vessel of hot water and then add the
spirit. Lay on with a fairly soft hog-hair brush in a warm room.
The starch solution is:

Arrowroot.40 grains
Water.6 ounces
Methylated Spirit.1 ounce

Mix the arrowroot in a little cold water. Boil the six ounces of
water, add the arrowroot, and stir until the mass becomes gelatinous.
Allow to cool and add the spirit with vigorous stirring. Dip the paper into
the solution or spread with a brush.
The special sizing solution sold for the purpose is, however, the easiest
and most comfortable to handle. It is a preparation of gelatine and starch
which by a newly discovered physical principle remains liquid at ordinary
temperature and keeps indefinitely. All one has to do is to pour a pool
onto the middle of the sheet of paper and spread the liquid over the surface
with a damp sponge or cloth.
One coat of the above sizings is sufficient for papers resembling
cartridge in texture, but two coats are required for rough absorbent papers.
It is essential that the sizing should be perfectly dry before the
application of the sensitizing solution.
Sensitizing.—The instructions given in the text-books need little
modification. The best method, after all, for ordinary work is to rub the
sensitizing solution on the surface of the paper with a fiannel pad and finish
off with a dry cloth. Very rough paper should be coated with a brush.
A solution of gum arabic, one part to two of water, is the best medium
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