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Exposure, 20
to 30 minutes. Wash 10 minutes in running water and dry. Brown or
purple tones may be had by sensitizing with the following solution
instead of the above:
Distilled water 1 oz.
Sliver nitrate 50 gr.
Tartaric or citric acid 1/2 oz.
Bathe the plates 5 minutes, keeping the fingers out of the
solution, to avoid blackened skin. Dry in the dark. Print to
bronzing under a strong negative; fix in hypo, toning first if
desired.

** A Substitute for a Ray Filter [120]
Not many amateur photographers possess a ray filter. A good
substitute is to use the orange glass from the ruby lamp. This can
be held in position in front of the lens with a rubber band. A
longer exposure will be necessary, but good cloud effects can be
procured in this manner.

** Electric Lamp Experiments [120]
Incandescent electric lamps can be made to glow so that they may
be seen in a dark room by rubbing the globe on clothing or with a
paper, leather or tinfoil and immediately holding near a 1/2-in.
Ruhmkorff coil which is in action but not sparking. The miniature
16 cp.


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