This glass chalice, the Lycurgus Cup, appears jade green when lit from the front but blood red when lit from behind. The colour change is a result of the Roman artists impregnating the glass with nanoparticles of silver and gold.
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This glass chalice, the Lycurgus Cup, appears jade green when lit from the front but blood red when lit from behind. The colour change is a result of the Roman artists impregnating the glass with nanoparticles of silver and gold.
