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Patek Philippe

That is a good question. I was thinking if they bake the enamel maybe they clear coat for protection.

 

The technique involves grinding colored glass or enamel pigments to a talc-like powder, mixing it with water or oil (Patek Philippe usually uses lavender oil), and painting the resulting paste meticulously (sometimes using a brush as fine as a single hair) onto a prepared metal surface. Once dry, the paste is fired in a kiln at temperatures of around 850°C, so that the powdered glass or pigment melts to form a new, impregnable surface and fuses to the metal base.Dozens of firings may be needed as multiple layers are built up; 



a coat or two of transparent enamel adds a final depth and brilliance. Because colors can alter during firing, the enamelist must be not just an artist but an alchemist and visionary, able to calculate how the pigments will interact and accurately imagine the finished hues in advance.

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