The methods of investigation of the microstructure and dispersion structure of holograms using different physical and chemical methods, including mercury porosimetry, optical and electron microscopy, X-ray micro analysis and investigations of latent images, are discussed. The theory of formation of holographic structure in the layers on bases of investigation of their micro structure is analyzed. The possibility of wavelength correction of reflection master-hologram by means of physical and chemical methods is shown. Hologram processing at supercritical condition of temperature and pressure, which may reduce the destruction of the microstructure of hologram from considerable Laplasian forces, is discussed. Our results of using improved layers of the dichromated gelatin for recording and processing of holograms and master-holograms are reviewed.
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