didymium
/daɪˈdɪmiəm/
noun
- A mixture of the rare earth elements praseodymium and neodymium, used in glassmaking to filter out yellow light.
- Some camera filters use didymium to enhance colors by blocking certain wavelengths.
- The welder's goggles contained didymium to reduce eye strain.
- Didymium glass is used by glassblowers to protect their eyes from the bright yellow glare of molten glass.