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A research of edible gelatin rainbow holograms is presented. Gelatin is an edible material with optical properties: it is transparent in the visible region of the spectrum and has refractive index close to refractive index of optical polymers. Gelatin is capable to transfer diffraction relief and save it for a long time. Gelatin holograms were prepared by nanoimprinting method from gelatin aqua solutions with different concentrations (1 part of gelatin per 5, 10, 15, 20, 25 parts of water). The samples were made o...