The wavelength difference threshold for stable binocular vision without color rivalry was measured in the region of 500 nm to 660 nm. The difference thresholds were found to be fairly large ranging from 10 to 50 nm as compared with those of monocular wavelength discrimination but the shape of the curve, when plotted as a function of wavelength, was similar to that of the monocular function. In a second experiment, a white standard was presented monocularly, and one of six hue loci was presented to the other eye. Difference thresholds were determined by varying purity to obtain stable binocular vision without rivalry. This threshold data showed an elliptical shape similar to monocular color discrimination data, when plotted in terms of CIE chromaticity diagram. The size of the ellipse, however, was much larger in the present case.

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Relief-type holograms were copied on PVC sheets from a master made on an amorphous AS₁₀Se_67.5Ge_22.5 film. The film is a comparatively hard photosensitive material with high resolution. The reconstructed image quality from the copied holograms was as good as that from the master hologram.

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