diactinic
/ˌdaɪækˈtɪnɪk/
adjective
- Allowing the passage of light rays that can cause chemical changes, especially ultraviolet light.
- Some types of glass are diactinic, meaning they transmit the rays that can fade dyes.
- Scientists tested the material to see if it was diactinic enough for their solar experiments.
- The photographer used a diactinic filter to let in the UV light needed for the special film.