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Holographic recording has been considered to be a combination of primery photocheinical recording processes and dark stages of development and amplification. Chroinium(VI) ions in lightexposed polymer matrix sites convert to chromium(V) compounds which may be regarded as latent image centres These processes induce a structurephase transmission in gelatin which favours a latent holographic structure with low difraction efficiency1 Water and isopropanol promote a redox process involving chromium(III) chromiumCV) compounds and polymeric medium phase-state modulation in exposed and unexposed areas. SPIE Vol. 1238 Three-Dimensional Holography: Science, Culture, Education (1989) / 211 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/24/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx