The average newly-fledged photographer wishes to begin before breakfast. The barn or the back-yard fence is good enough for him, and if nothing else alive is in sight, it is easy enough to try it on the dog. Few dogs, however, have a proper sense of the responsibility of being photographed. After everything is carefully arranged, they get up and want to go home. Sometimes they remain silent until the picture is started, when they begin to stroll around and make eight or nine dogs on the plate; or they sit still and only wag their ears, until the negative shows something like a halo of ears. This would give a professional photographer much worriment of mind, but the amateur is generally wise enough to see that his failures are the funniest things he has.--Photo. Times.
ORTHOSCOPIC PHOTOGRAPHY.
It is well-known that there are a large number of coal-tar color products, which have the property of causing an orthoscopic action on the ordinary sensitive dry plate, making the plate more sensitive for a certain color than the others; for instance, eosine is a superior sensibilator for green-yellow and yellow-green; cyanin, again, is especially sensitive for reds. Other products, such as rhodamin, cyclamin, methyl, violet, and others, generate in each instance an especial color sensitiveness.
While we have no deficiency in these mediums which answered for the greens and yellows, we have but few that answer for the various shades of red. Although Dr. Vogel has strongly recommended a mixture of chinolin red and chinolin blue (cyanin), the latter has two great drawbacks, viz., the salt is very dear, and does not keep. To overcome this difficulty I have instituted numerous experiments to replace the above with a more durable and cheaper medium. Among the various substances which I have tried, the mixture of indophenol and malachite green, has given me the most satisfactory results. Malachite green alone produces a strong sensibility to red, but the addition of the indophenol greatly enhances this sensibility.
In connection with the experiments with this solution, the interesting fact was observed that the sensibility for blue was greatly reduced in the brom-gelatine film, while green and yellow appeared in their true color values.
My proceeding is as follows:
(A.) Dissolve 0.1 g. indophenol (napthalin blue) in 500 ccm. alcohol.
(B.) Dissolve 1 g. malachite green in 200 ccm. water.
The latter solution is heated to about 70° c.
In the meantime, prepare a solution of 10 g. doppelt chrom sauris kadi in 100 ccm. water, at a temperature of 70 to 80°, then pour this to the hot solution of malachite green.