Wikidata facts
- Subclass of
- alloy
- Has part
- praseodymium
Show 3 more facts
- described by source
- Encyclopædia Britannica 11th edition
- discoverer or inventor
- Carl Gustaf Mosander
- element symbol
- Di
Sources (2)
via Wikidata · CC0
~6 min read
Encyclopedic overview
4 sectionsContents
- Discovery
- Glassmaking
- Industrial use
- References
thumb|Didymium glasses
Didymium () is a mixture of the elements praseodymium and neodymium. It is used in safety glasses for glassblowing and blacksmithing and filter lenses for flame testing, especially with a gas (propane)-powered forge, where it provides a filter that selectively blocks the yellowish light at 589 nm emitted by the hot sodium in the glass without having a detrimental effect on general vision, unlike dark welder's glasses and cobalt glasses. The usefulness of didymium glass for eye protection of this sort was discovered by Sir William Crookes.
Excerpted from Wikipedia’s “didymium” article, available under the CC BY-SA 4.0 licence.