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These dye baths can be mixed in any desired proportions to produce other hues; thus, auramine and chrysoidine for sunlight and gaslight effects, according to relative proportions and depth of toning, and if not washed too clear after dyeing, they add a tint to the tone. Malachite or Victoria green with rhodamine makes dull blues, suitable for night effects. Auramine with a little Victoria blue makes greens, from dull sage green to bright grass green, according to proportions and depth of toning. A variety of fine brown and sepia tones are produced by light toning with suitable mixtures, of auramine, chrysoidine and rhodamine. For more brilliant coloring, leave the positives longer in the preparing bath or longer in the dye bath, or both. I have produced some good double-tone effects, but this application requires further working out before publication.
It is important to dissolve the dyes completely, and it usually takes hours, with frequent stirring to do so unless hot water is used. Certain other precautions must be taken. The presence of a very small amount of hypo may prove disastrous; positives must be thoroughly washed before the preparing bath, and never touched with fingers wet with hypo. Chlorides, ardmides and alkalies are also contra-indicated. These precautions involve no hardship, and the unrivalled economy and adaptability of the process promise to make it supersede all other methods of cine positive toning. The colors obtained are quite permanent, and the surface does not dry matts, as with copper toning. Unlike positives dyed on other mordants, the effect upon the screen is exactly what it is to the eye when the positives are held in the hand.
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