TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The metal particles are gold particles, silver particles, copper particles, platinum particles, palladium particles, rhodium particles, iridium particles, ruthenium particles, silver-coated copper particles, and/or osmium particles, preferably gold particles, silver particles, copper particles, platinum particles, palladium particles, and/or silver-coated copper particles. The metal particles have an average particle diameter of 0.01-100 mu m. The copper formate particles have an average particle diameter of 1 nm to 5 mu m. The base material is resin, paper, glass, silicon type semiconductor, compound semiconductor, metal oxide, metal nitride, and/or timber. Preferred Conditions: The heat-processing temperature is 60-300 degrees C, and is carried out in a non-oxidizing atmosphere.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compounds: The amine compound is ethanolamine, N-methylethanolamine, N,N-dimethylethanolamine, 2-methoxyethylamine, N-methyl-2-methoxyethylamine, N,N-dimethyl-2-methoxyethylamine, bis(2-methoxyethyl)amine, 2-ethoxyethylamine, N-methyl-2-ethoxyethylamine, N,N-dimethyl-2-ethoxyethylamine, bis(2-ethoxyethyl)amine, 2-n-propoxyethylamine, N-methyl-2-n-propoxyethylamine, N,N-dimethyl-2-n-propoxyethylamine, 2-i-propoxyethylamine, N-methyl-2-i-propoxyethylamine, N,N-dimethyl-2-i-propoxyethylamine, 2-n-butoxyethylamine, N-methyl-2-n-butoxyethylamine, N,N-dimethyl-2-n-butoxyethylamine, 2-(2-hydroxyethyloxy)ethylamine, N-methyl-2-(2-hydroxyethyloxy)ethylamine, N,N-dimethyl-2-(2-hydroxyethyloxy)ethylamine, 2-(2-methoxyethyloxy)ethylamine, N-methyl-2-(2-methoxyethyloxy)ethylamine, N,N-dimethyl-2-(2-methoxyethyloxy)ethylamine, 2-(2-ethoxyethyloxy)ethylamine, N-methyl-2-(2-ethoxyethyloxy)ethylamine, N,N-dimethyl-2-(2-ethoxyethyloxy)ethylamine, 1,1-dimethyl-2-hydroxyethylamine, N-methyl-1,1-dimethyl-2-hydroxyethylamine, N,N-dimethyl-1,1-dimethyl-2-hydroxyethylamine, 1,1-dimethyl-2-methoxyethylamine, N-methyl-1,1-dimethyl-2-methoxyethylamine, N,N-dimethyl-1,1-dimethyl-2-methoxyethylamine, 1,1-dimethyl-2-ethoxyethylamine, N-methyl-1,1-dimethyl-2-ethoxyethylamine, N,N-dimethyl-1,1-dimethyl-2-ethoxyethylamine, 3-hydroxypropylamine, N-methyl-3-hydroxypropylamine, N,N-dimethyl-3-hydroxypropylamine, 3-methoxypropylamine, N-methyl-3-methoxypropylamine, N,N-dimethyl-3-methoxypropylamine, 3-ethoxypropylamine, N-methyl-3-ethoxypropylamine, N,N-dimethyl-3-ethoxypropylamine, 3-n-propoxypropylamine, 3-i-propoxypropylamine, N-methyl-3-i-propoxypropylamine, N,N-dimethyl-3-i-propoxypropylamine, 3-n-butoxypropylamine, N-methyl-3-n-butoxypropylamine, N,N-dimethyl-3-n-butoxypropylamine, N,N',N'-trimethyl-N-(2-hydroxyethyl)ethylenediamine, N,N',N'-trimethyl-N-(2-methoxyethyl)ethylenediamine, and/or N,N',N'-trimethyl-N-(2-ethoxyethyl)ethylenediamine. Preferred Composition: The ink composition comprises (in wt.%) metal particles (0.1-99), amine compound (0.1-80), and copper formate particles (0.1-80). The ink composition further contains a dispersion medium (1-90) chosen from alcohol, ether, ester, aliphatic hydrocarbon, and aromatic hydrocarbon, preferably hexanol, terpineol, methyl-t-butyl ether, diethylene glycol dimethyl ether, tetrahydrofuran, n-hexane, and/or gamma -butyrolactone. The ink composition has a viscosity of 1-1000 Pa.second.