Colored photochromic glasses and method

Details Colored photochromic glasses and method Colored photochromic glasses and method

1985-05-03

1987-12-01

Bell, Mark L.

Stock material or miscellaneous articles

Composite

Of quartz or glass

501 13, 430962, C03C 406

Patent

active

047104309

ABSTRACT:
This invention is directed to a method for modifying the coloration produced in a silver halide-containing photochromic glass when heat treating the glass at a temperature not exceeding 450.degree. C. under reducing conditions. The method comprises subjecting such a glass having a base composition which contains at least 1% by weight Li.sub.2 O, at least 2% by weight Na.sub.2 O, and at least 6% by weight Li.sub.2 O+Na.sub.2 O+K.sub.2 O to an ion exchange reaction, wherein lithium ions, and potassium ions, when the latter are present in the composition, in the glass surface are exchanged with sodium ions from an external source, prior to the reduction heat treatment.

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