The following uses for erbium are gathered from a number of sources as well as from anecdotal comments. I'd be delighted to receive corrections as well as additional referenced uses (please use the feedback mechanism to add uses).
- nuclear industry
- metallurgical uses. Added to vanadium, for example, erbium lowers hardness and improves workability
- erbium oxide is pink and is a colourant in glasses and porcelain enamel glazes
- photographic filter