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Carbon pictures are therefore only permanent according to the degree in which the coloring matter employed is capable of resisting the decolorizing action of light.
The "effervescence" he refers to was chlorine, which he proceeded to confine in a suitable vessel and examine more fully. He described it as having a "quite characteristically suffocating smell," which was very offensive. He very soon noted the decolorizing or bleaching effects of this now product, finding that it decolorized flowers, vegetables, and many other substances.
Out of a shadowy hollow behind a long white rock, on the lower edge of that part of the steep which lay in the moonlight, came softly a great panther. In common daylight his coat would have shown a warm fulvous hue, but in the elvish decolorizing rays of that half hidden moon he seemed to wear a sort of spectral gray.
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