Patent ID: 7645480

Claim:
Procedure for reproduction of a photographic picture in an article of glass, where the picture comprises one or more colours, the procedure comprising: transferring the picture to a surface of the article, wherein colours are applied to the surface and dried one after another until all colours are applied; and firing the article in a kiln, comprising: staffing at room temperature and raising the temperature to a first temperature where it is maintained for a first period of time, raising the temperature to a second temperature, where it is maintained for a second period of time, the second period of time being sufficient to lower the viscosity of glass such that the colour substances mix with the glass, raising the temperature to a third temperature, where it is maintained for a third period of time, the third period of time being sufficient to allow the colouring substances to melt into and beneath an immediate surface of the glass, lowering the temperature to a fourth temperature, where it is maintained for a fourth period of time, and lowering the temperature to a fifth temperature, where it is maintained for a fifth period of time, after which the temperature is lowered back to room temperature.