DECORATING GLASS-CERAMIC ARTICLES

摘要

This invention relates to the decorating of Li2O and/or Na2O-containing glass-ceramic articles through the stain coloring thereof utilizing copper and/or silver ions, these articles being subsequently chemically strengthened through an ion exchange reaction of the large-ion-for-small-ion type carried out in a bath of molten salt. More specifically, the present invention is concerned with the prevention of unsightly defects which can occur in the stain coloring during the chemical strengthening process. This is accomplished by passing sulfur dioxide gas through the bath of molten salt.