Spectrally different object colors that match for one illuminant generally do not remain matched when the illuminant is replaced by another. The degree of the chromaticity-mismatch has been studied by using various numerical techniques such as Monte Carlo, statistical, and linear programming methods.

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The photocoloration and the discoloration of organic titanium complexes were investigated.
The organic titanium complexes of alkyltitanates with hydroxy -carboxylic acids such as citric, tartaric, malic or lactic acids were colored by irradiating with U.V. ray. The color after irradiation varied in the different organic titanium complexes when they were solid-state, and also varied in different solvents when they were solution-state.
It was concluded that the formation of the colored products was due to the photoreduction from Ti (IV) to Ti (III).
On the other hand, the color produced by U.V. ray disappeared when the colored products were allowed to stand in the dark. Oxygen played a dominant role in the discoloration.

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A magenta colored metallochromic ferrous-bathophenanthroline chelate (Fe·Batho₃) was formed in. a polymer matrix containing ferric acetylacetonate (Fe·AA₃) and bathophenanthroline (4, 7-diphenyl-1, 10-phenanthroline) by an electron bombardment. The magenta color was deepened by a heat treatment of ter the bombardment. The chelation was occured selectively between bathophenanthroline and ferrous ionic compound in an acidic condition. Thus the coloration was mainly due to the reduction of Fe·AA₃ and it was active in the matrices, such as PVC and one containing polyhaloganated additive liberating acidic components by the bombardment. The post-heating seemed to be effecitive to promote the chelation.
This coloring process is suitable for a non-photosensitive negative type electron beam recording (EBR) medium. The recorded signal is expressed with the metallochromic component. And the coloration is occured in the lower charge density region of the bombardment comparing with the other coloring process. The high sensitivity to electron is due to the fact that the rate determining step of the coloration is a simple reduction in Fe·AA₃ and the liberated component from matrix promotes the chelation followed the reduction

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The ion exchange treatments changed the pH dependence of physical retardance of photographic gelatins. It was suggested that some ionic substances affecting physical ripening were eliminated by the process. The physical retardance lost in the ion exchange could be partly restored by the addition of adenine and sodium thiosulfate.

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