A DECORATIVE SUBSTRATE, ESPECIALLY AN ARTIFICIAL JEWELLERY STONE WITH A COLOUR EFFECT AND METHOD FOR ACHIEVING THE COLOUR EFFECT FOR A TRANSPARENT SUBSTRATE

摘要

The invention concerns a decorative substrate, especially an artificial jewellery stone having a colour effect, being formed by a transparent substrate which comprises the following layers on the back side deposited in the following order from the back side of the substrate: an optically modifying layer, a reflection layer formed by at least one metal or by an alloy from a group including Au, Ag, Cu, Al, Cr, Ti, aluminium bronzes and alloys of Au, Ag and Cu, an interposed layer having a thickness of 10 to 100 nm and a layer of a protecting varnish. Between the optically modifying layer and the reflection layer is alternatively comprised an adhesive layers formed by at least one metal oxide from a group of metals including Al, Ti, Cr and Sn. The invention concerns also a method for achieving the colour effect for a decorative transparent substrate.