Photochromic glass
Vidrio fotocromático
- Date
- 1964-1966 · confidence high
- Place
- Corning, New York, United States
- Credited to
- Donald Stookey and William Armistead (Corning Glass Works)
- Field
- Communication
What it is
A glass with silver-halide crystals that darkens under ultraviolet light and clears in the shade. Corning marketed it for spectacles around 1966.
Armistead and Stookey published the material in 1964; the first Photogray spectacles appeared in 1966.
What it led to
- spectacles that darken in sunlight
- plastic photochromic lenses
- light-responsive materials