Dichroic glass
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The brilliant dichroic optical properties of dichroic glass are the result of multiple micro-layers of metal oxides. These thin layers of oxides have a total thickness of three to five millionths of an inch.
NASA developed dichroic glass for use in face shields in space suits. Multiple ultra-thin layers of different metals (gold, silver, titanium, chromium, aluminium, zirconium, magnesium, silicon) are applied to the surface of the glass. The glass is then kiln fired at extreme temperatures in a vacuum.
The resulting plate of dichroic glass can then be fused with other glass in multiple firings. Certain wavelengths of light will either pass through or be reflected, causing an array of colour to be visible. Due to variations in the firing process, individual results can never be exactly reproduced; each piece of fused dichroic glass is unique and no two pieces are ever the same.
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