Lycurgus Cup
... that the 4th century Roman glass Lycurgus Cup is dichroic; lit from in front it is green, but thanks to surface plasmon resonance it is red when lit from behind?
... that the 4th century <a href="./Roman_glass" id="mwDKc" rel="mw:WikiLink" title="Roman glass">Roman glass</a> <b id="mwDKg"><a href="./Lycurgus_Cup" id="mwDKk" rel="mw:WikiLink" title="Lycurgus Cup">Lycurgus Cup</a></b> is <a class="mw-redirect" href="./Dichroic" id="mwDKo" rel="mw:WikiLink" title="Dichroic">dichroic</a>; lit from in front it is green, but thanks to <a href="./Surface_plasmon_resonance" id="mwDKs" rel="mw:WikiLink" title="Surface plasmon resonance">surface plasmon resonance</a> it is red when lit from behind?