can't read?
Holmium(III) oxide, or holmium oxide is a chemical compound of a rare-earth element holmium and oxygen with the formula Ho2O3
H 1421 (OTTO) Holmium oxide, 99% Cas 12055-62-8 - used for cubic zirconia and glass, providing yellow or red coloring. Holmium oxide has some fairly dramatic color changes depending on the lighting conditions.