BIR KRISTAL SISEDEN MEZKUR SISENIN ICINDEKI BIR LIKID MADDEYE DOGRU KURSUNUN KACMASINI ASGARI SE- VIYEYE INDIRMEK ICIN PROSES.

摘要

Process for the treatment of the surface of a solid object made of a material which has a vitreous structure and especially crystal, lead glass and the like and containing a certain content of heavy metals and especially lead, this surface being liable to come into contact with media of acidic nature and especially alcohols such as brandy, whisky, wines or fruit juices and similar food products, with a view to preventing the said heavy metals from migrating towards the said liquids, characterised in that it consists in bringing about, in a surface region of the said surface intended to come into contact with the liquid, and after having partly removed the lead ions present in this surface region, the formation of a silicoaluminous diffusion barrier opposing this migration towards the liquid, by ion exchange between the said solid material with vitreous structure and a coating temporarily applied to the said surface, this coating itself consisting of a silicoaluminous crust resulting from the heating of a layer of kaolin applied to the said surface in the form of a thixotropic slip of pure hydrated aluminium silicate.