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Dichroic glass is glass containing multiple micro-layers of metal oxides which alter its optical properties. The invention of dichroic glass is often erroneously attributed to NASA and its contractors, who developed it for use in dichroic filters. Dichroic glass dates back to at least the 4th century CE as seen in the Lycurgus cup, a Roman relic. Multiple ultra-thin layers of different metals (gold, silver), metal oxides (titanium, chromium, alum … Read More