Wall, E. J. (Edward John), 1860-1928 · Boston, Mass. : American Photographic Publishing Co. · leaf 209
ange back to blue. It is thus possible to slightly alter the colors of a heliochrome, either by warming or damp- ing, and as soon as the correct colors are seen it should be cemented up. The prism should be clipped on to the picture and then it should be placed in a warm place to dry. When dry, the… … vented from reaching their surfaces, and a viewing box can easily be made as shown in Fig. 22. In this ABCD is the box, in one end of which is supported the heliochrome, while at the other end is a peep hole E through which the picture can be seen. M is a small piece of mirror, adjustable on a…
Color photography
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