holmium oxide
... that luminescence of holmium oxide is so bright that the material changes its color from yellow to orange-red under fluorescent light ?
... that <a href="./Luminescence" id="mwF10" rel="mw:WikiLink" title="Luminescence">luminescence</a> of <b id="mwF14"><a href="./Holmium(III)_oxide" id="mwF18" rel="mw:WikiLink" title="Holmium(III) oxide">holmium oxide</a></b> is so bright that the material changes its color from yellow to orange-red under <a class="mw-redirect" href="./Fluorescent_light" id="mwF2A" rel="mw:WikiLink" title="Fluorescent light">fluorescent light</a> <i id="mwF2E">(pictured)</i>?