Wood's Glass

A filter allowing only UV light to pass.

From Rosco US : Filters : Permacolor
Woods Glass (Cold Mirror)

This dichroic cold mirror reflector passes near UV energy in the range of 365-400nm, reflecting most visible light energy. Applications for this reflector include filters for creating black light effects (requires a lamp with a high UV output, eg. HMI discharge) or instrument mirrors that must allow UV energy to pass through them and not be reflected out of the fixture. Available in standard and custom sizes.

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