Method for the manufacture of a layer from a thermochrome lacquer, and its use

In a method of coating a smooth surface with a thermochromic, water-resistant layer, with the aid of two reaction components being substantially free of any water and storable separately, and with the aid of a film-forming component and a hardener,

• one reaction component being an organic sulfur compound splitting off sulfur in ionized form only upon being heated above 70.degree. C., and thereby assuming a dark discoloration,
• the other reaction component being a metal compound produced with the aid of a resin base selected from the group consisting of a methacrylic acid dissolved in aromatic solution means and a compound containing epoxy groups said metal compound being selected from the group consisting of an oxide, an inorganic salt, or a soap of a monocarboxylic acid wih 2, 8, 10, 12, 14, 16, 18, 20, 22 or 38 C-atoms, or a dicarboxylic acid metal compound wherein the metal is selected from the group consisting of bismuth, copper, silver, gold, mercury, thallium, lead, vanadium, molybdenum, tungsten, rhenium, iron, cobalt, nickel, palladium, or platinum,
• the steps comprising:
• dispersing said metal compound in said resin base,
• mixing said reaction components with said film-forming component and said hardener to yield a multi-component substantially transparent resin, suitable of being used for screen printing, thereby setting off an exothermal reaction generating a temperature not higher than about 40.degree. C., and
• applying said multi-component resin to said surface and allowing it to harden thereon at room temperature for at least 30 minutes, whereby said multicomponent resin is hardened to a substantially bone-dry state.