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Scientific American, Vol. 70, No. 12 (1894) (1894)
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ear the horizon, increasing in intensity toward the subjected to the reducing process. A plate may also be prepared by flowing a solu- tion of gela- tin over a clean cover glass, allowing it to dry, and then . treating it to an alum bath and sub- sequent wash- ing. : The slide to be colored, which… … picture-bearing film. The follow- rocks and tree trunks may be tinted with brown, blue, © 1894 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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