Process of marking glass and method of proving the temperature and time at the process of the marking

摘要

A glass is temperature-induced marked by applying a coating composition containing metal compound(s) and binder to the glass, subjecting the glass to heat treatment at less than 400[deg]C for several hours. Metal ions from the coating composition diffuse into the glass and are reduced by ions in the glass or by external reducing agents to the corresponding metal atoms, which aggregate into particles and discolor the glass. Independent claims are also included for the following: (A) a coating composition, for temperature-induced marking of glass comprising a eutectic mixture of components such as metal salts and/or binder; and (B) a method of detecting the duration and/or applied temperature of heat treatment in a glass applied with the coating composition, comprising comparing the discoloration of the glass to the discoloration of a reference glass or using a photometer and comparing the result to reference values.