ion of the blue and violet spectralrays on the photographic plate. If this exposure is pro-longed, the green, then the yellow, and finally also the redrays exert a chemical action. A photograph of the spectrumextends by short exposure to line F; prolonged exposurewidens the band towards the red,… … the collodion plate, and we notice that the first is mainlysensitive for blue rays between G and H, whereas the lattershows greatest sensitiveness for violet rays. If these curvesare transformed for the normal spectrum, we obtain thesensitiveness shown in fig. 28. The most powerful action on both…
Color photography · Color printing
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