Respecting the production of pictures by means of emulsion, ground opal
being the best, the system I employ is as follows: After well cleaning
the glass, coat it with emulsion (which had better not be too thick).
When dry it is exposed and developed with the usual oxalate developer,
to which a little bromide of potassium has been added. The remainder of
the operations is as usual. Those varnished with dead varnish can be
tinted and worked up with colored crayons or black lead pencil and make
very pleasing pictures. It is needless to add that they are also to be
finished in water-colors if thought preferable.--_G. W. Martyn, in Br.
Jour. Photo_.
* * * * *
PAPER NEGATIVES.
The process of A.C.A. Thiebaut is as follows: the paper has the
following advantages:
First. The sensitive coating is regular, and its thickness is uniform
throughout the entire surface of each sheet.
Second. It can be exposed for a luminous impression in any kind of slide
as usually constructed.
Third. It can be developed and fixed as easily as a negative on glass.
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