The Colours of Some Metals and Alloys

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Abstract
Spectral reflectivity curves have been determined for sterling silver, gold, some gold alloys, platinum, brass, nickel silver, aluminium and stainless steel, as well as for a number of electroplated coatings, using an abridged spectrophotometer. From these curves the overall brightness has been calculated and also the position on the colour triangle. Copper and gold, and alloys of these metals, have red or yellow colours of low saturation. The remaining metals are substantially white or grey, as they fall near the white point, but their reflectivity is less than unity; however, zinc, chromium and aluminium are shown to have a faint bluish tinge, and the others have a yellow tinge, except for tin-nickel, which is faintly pink. These faint colours may subconsciously affect customer preference.

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