Abstract
II. THEIR APPLICATIONS. PANCHROMATIC PLATES. TESTING DYES, ETC. The commercial “ortho-” or “iso-chromatic” plates, which are specially sensitised for green, besides their obvious uses for scientific purposes in which red sensitiveness is not necessary, are of especial use in the photography of coloured objects where an improved result, as compared with an ordinary plate, is desired, rather than a full correction. As the unassisted eye is not a very keen critic of the relative brightnesses of different colours, especially when they are not in juxtaposition, such an improvement is often all that is necessary. The deficient sensitiveness to red causes a pure red to be represented as if it were black. But almost all colours in nature and most artificial colours are not pure, and so far as a red contained any green or white, that is so far as it reflected any other light whatever in addition to the pure red, except pure blue, then the rendering of the red would be improved. But this fact as to most natural colours being mixed is also a disadvantage, for all coloured objects, so far as they reflect any red, will suffer because of the want of red sensitiveness of these plates.
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JONES, C. On Colour Sensitised Plates 1 . Nature 94, 701–703 (1915). https://doi.org/10.1038/094701a0
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DOI: https://doi.org/10.1038/094701a0