Process for producing photochromic silicate glass film containing silver halide particles

摘要

A process for producing a photochromic silicate glass film is disclosed which is characterized by the steps of forming a solution containing silver ions and a film-forming silicate monomer in a solvent common to both, removing the solvent from the solution to produce a discreet film or a film coating on an article, and exposing the formed film to a source of halide ions to form fine silver halide particles within the film.