TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Method: The first metal source comprises a precursor ink which comprises a metal, and the first metal source is applied on a portion of the surface of the substrate where the surface-treating composition is patterned. The second metal source is applied on at least one of entire surface of the substrate or a portion of the substrate, where the surface-treating composition is patterned to form patterned metal film. Preferred Components: The surface treating composition is patterned to have a line width of 200-5 micrometers. The reductant includes at least one hydrazine, lithium aluminum hydride, alkyl aluminum hydride, sodium borohydride, zinc borohydride, trialkyltin hydride, alkyl silane and/or their complexes. The substrate includes at least one glass, metal, semiconductor, ceramic or plastic. The first metal source includes at least one metal precursor ink, a metal powder ink or metal paste. The first metal source is metal precursor ink, and where the metal precursor ink comprises at least one organo-metallic compound having a carbon-metal bond, a metal-organic compound containing an organic ligand and comprising a bond between a non-carbon element comprising oxygen, nitrogen or sulfur with a metal or an inorganic compound. The inorganic compound includes at least one metal nitride, a metal halide, a metal sulfide, a metal hydroxide or a metal carbonate. The first metal source forms a metal layer on a portion of the substrate where the surface-treating composition is patterned.    TECHNOLOGY FOCUS - POLYMERS - Preferred Method: The polymer and the reductant are bonded to each other in the surface treating composition. The method further comprises: reducing the patterned metal film; and applying a second metal source onto the patterned metal film and sintering the second metal source. Preferred Components: The polymer is hydrophilic polymer, hydrophobic polymer or amphipathic polymer. The polymer includes at least one ethyl cellulose, polystyrene, or polyvinyl pyrrolidone. The polymer has at least one shape comprising spherical, bead or porous shape. EXAMPLE - Ethyl cellulose (1 g) and hydrazine (0.03 g) were dissolved in toluene (9 g) to obtain surface treating composition. The surface-treating composition was patterned on a glass plate by a printing. After 5 minutes the surface-treating composition was dried to remove the solvent and to obtain polymer film. Then silver precursor ink ((10 wt.%) silver 2-ethyl-hexanoate in acetonitrile) was applied onto the glass plate at a thickness of 20 micrometers. The silver precursor ink was further applied and sintered for 2 minutes under an ambient atmosphere at a temperature of 200 degrees C.