Latent image on a photographic plate which has been exposed, then bathed in a solution of a desensitizing dye, may be destroyed by a second exposure to light of the proper wave length. Quantitative measurements of the variation of den- sity with wave length were made on plates treated with five desensitizing dyes. In three cases it was also possible to make indirect determinations of the spectral distribution of energy absorbed by the dyed silver bromide; less complete data are available for the other two. There is good correlation between reversal and energy absorption. Where the absorption by silver bromide and by the dye are sufficiently separated in wave length, there are maxima corresponding to each.
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Carroll et al. (1933) studied this question.