Neodymium (III) Oxide is characterized by sharp emissions bands, and thus it has special properties when used as a doping agent for glass, in applications including glasses, light bulbs and lasers, to make a product known as neodymium, or alexandrite glass. Its absorption of yellow wavelengths makes it appear in different colors depending on light composition: blue under fluorescent light, and red under natural or incandescent light, which contains less light on the violet end of the spectrum. This property makes it useful for applications requiring color band filtering, such as photography (including astronomical photography), welding glasses, and automotive mirrors.
