TECHNOLOGY FOCUS - ELECTRONICS - Preferred Components: The function layer is a transparent electrode, electrochrome layer, protective layer or reflection layer. The thickness of the thermochrome layer is 100-3000, preferably 150-1000 nm.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The substrate is glasses, ceramics, metals, semiconductors, polymer materials and their compound system.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: The separation is a physical or chemical gas phase separation, preferably thermal vacuum deposition, electron deposition and/or sputtering. The process further comprises separating a further function layer in the vacuum, before or after the separation of the thermochrome layer. Preferred Components: The dye is triphenylmethane dye, pyridinium phenolate betaine, pyranine, sulfophthalein, Reichardt's dye, indicator dye and/or azo dye. The developer is an ester of gallic acid, hydroxycarboxylic acid and/or bis-4-hydroxyphenyl derivative. The flux is from hydroxy carboxylic acid, amine, amide, hydroxy compound, preferably octadecanol, dodecanol or hexadecanol and/or paraffin. The thermochrome precursor further comprises at least an organosilane compound of formula (Xn-SiR4-n) (I), preferably dimethyldichlorosilane, trimethylchlorosilane, 3-chloropropyl trichlorosilane, 3-cyanopropyl trichlorosilane, diphenylsilanediol, N-docosyl trichlorosilane, vinyltriethoxysilane, gamma -aminopropyl trichlorosilane, hexamethyldisilazane and/or triphenylsilanol. The precursor contains 0.3-15 wt.% of the dye, 0.3-18 wt.% of the developer and 67-99.4 wt.% of the flux. The precursor further comprises at least an interfacial active substance, which is bis(2-ethylhexylsulfosuccinate), hexadecyl ammonium bromide, sodium dodecyl sulfate and/or anhydride, preferably maleic acid anhydride or succinic acid ester. The thermochrome complex is in the form of associated dimer or agglomerates.X = 1-16C-alkyl, 1-16C-alkoxy, aryloxy, hydroxy or halo; andR = 1-16C-alkyl, 1-16C-alkoxy, amino-, CN-, mercapto- or glycide- structure.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The polymer materials are polyethylene, polypropylene, cyclic olefin, polyester, polycarbonate, poly(meth)acrylate, polyamide, and/or acrylonitrile-butadiene-styrene copolymer. EXAMPLE - A thermochrome complex containing tetradecanol (14.5 wt.%), bis(4-hydroxyphenyl)sulfide (2 wt.%) and Pergascript Black (RTM: Main component for black formulations) (1.5 wt.%) was contacted with a ceramic surface (pyrope) and deposited at 105 degrees C and 6.5x 10-7 mbar.