Method for producing a metal decoration on a dial and dial obtained according to this method

A method of producing at least one metal decoration on a substrate made of insulating material having a curved upper surface, the method comprising:

• a) providing the substrate and depositing a photosensitive resin layer directly on the curved upper surface of the insulating material of the substrate;
• b) irradiating the photosensitive resin layer through a mask defining a contour of desired decorations as well as of photopolymerised areas and of non-photopolymerised areas;
• c) dissolving non-irradiated areas of the photosensitive resin layer in order to show in places the substrate at the location of the decorations;
• d) depositing a first adhesion layer and a second electrically conductive layer via a vapour deposition on the substrate and the photopolymerised areas;
• e) galvanically depositing a layer of a first metal or of a metal alloy from said second electrically conductive layer in order to form at least one block substantially reaching the upper surface of the photosensitive resin layer;
• f) performing surfacing and polishing in order to remove surplus of the galvanically deposited layer;
• g) eliminating a remaining resin layer by plasma etching;
• and
• h) eliminating the first and second layers by a wet etching.