Reflectivities of gold-silver alloys between 500 and 1,000 fine are given for six wavelengths and the curve showing spectral dispersion of reflectivity of pure gold is compared with those produced by other workers. The polishing technique is shown to have a profound effect on the optical properties, with a range of up to 15 percent in reflectivity being measured on different, apparently flawless, surfaces of pure gold. A method for determining the silver content of alloys within the range 800-1,000 fine, without making use of a reflectometer, is described.

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