Process for minimizing the migration of lead from a crystal flask towards a liquid located in said flask

Abstract From the Canadian patent

Process for treating the surface of a solid article made of a material having a vitreous structure, such as crystal, lead glass and the same and containing some, amounts of heavy metals such as lead said surface being liable to be into contact with products of acid character, such as alcohols e.g cognac whisky, wines or fruit, juices, or acid foodstuffs with a view to prevent said heavy metals from drifting into said acid products, characterized in that it comprises forming in a superficial area of said surface, after partially removing the lead ions from said area a silico-aluminous, diffusion barrier opposing said drift into said acid product by ion exchange between, said material having …