Wood's glass

Two "black-light" ultraviolet fluorescent tubes. The glass envelopes illustrate the dark blue color of Wood's glass, although these modern tubes actually use another optical filtering material.

Wood's glass is an optical filter glass invented in 1903 by American physicist Robert Williams Wood (1868–1955), which allows ultraviolet and infrared light to pass through, while blocking most visible light.[1]

  1. ^ Williams, Robin; Gigi Williams (2002). "Wood, Professor Robert Williams". Pioneers of Invisible Radiation Photography. RMIT Online University, Melbourne, Australia. Retrieved January 16, 2013.