ceof the dyes of the mineral order. Fig. 9 shows the absorption of two red dyes. (I.) isEosine on paper; (II.) rose madder. The colour tone ofboth appears the same, but their purity differs, and the rosemadder looks almost brown beside the Eosine. A distinct limit between both does not however… … Fig. 9. Most aniline dyes cannot resist the action of light; they 42 TH RE I:-CO LOUR PHOTOGRAPHY, bleach under its influence and we call them fugitive. Thereason of this quality, which greatly reduces the practicalvalue of these dyes, may partly be found in their compli-cated chemical composition,…
Color photography · Color printing
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