NOVELTY - Liquid metal salt (I) is new, in which a metal (M) ion is surrounded by neutral ligands (L), or by a combination of neutral ligands (L) and negatively charged ligands (Y1) such that the total negative charge of the total number of negatively charged ligands (Y1) is smaller than the oxidation state of the metal ion so that the metal complex has an overall positive charge, with at least one counter anion (X), where (M) is e.g. copper, zinc, silver and gold, (Y1) is e.g. chloride, bromide, iodide and thiocyanate, and (X) is a counter anion e.g. tetrafluoroborate and triflate.    USE - (I) are is useful: in an electrodeposition process, electrochromic devices and fuel cells; and for electrodeposition of a metal (M) including copper, zinc, silver, gold, platinum, cobalt, nickel, tungsten, molybdenum, and aluminum, at a current density of at least 10 Angstrom /dm, battery applications, electropolishing applications, for electroless deposition of a metal M consisting of copper, zinc, silver, gold, platinum, cobalt, nickel, tungsten, molybdenum, and aluminum (all claimed).    ADVANTAGE - (I) is stable in an inert atmosphere at 90 degrees C for at least 2 days, preferably at least 5 days. The liquid metal salts surprisingly exhibit improved stability and increased mass transport over the ionic liquids with silver and zinc complexed with alkyl amines and bis(trifluoromethanesulfonyl)amide anion.    DETAILED DESCRIPTION - Liquid metal salt is new, in which a metal (M) ion is surrounded by neutral ligands (L), or by a combination of neutral ligands (L) and negatively charged ligands (Y1) such that the total negative charge of the total number of negatively charged ligands (Y1) is smaller than the oxidation state of the metal ion so that the metal complex has an overall positive charge, with at least one counter anion (X), where (M) is a metal consisting of copper, zinc, silver, gold, platinum, cobalt, nickel, tungsten, molybdenum and aluminum, (L) is a neutral ligand and is selected from the group consisting of acetonitrile (AN), propionitrile, butyronitrile, isobutyronitrile, acrylonitrile, 2-hydroxycyanoethane, phenylacetonitrile, benzonitrile benzylnitrile, dimethylformamide (DMF), acetamide, N,N-dimethylacetamide, formamide, N-methylformamide, N-ethylacetamide, dimethylsulfoxide (DMSO), dimethylsulfone (DMSO2), hexamethylphosphoramide (HMPA), N-methylpyrrolidone (NMP), pyridine, morpholine, tetrahydrofuran (THF), diethyl ether, dimethoxyethane (DME, monoglyme), bis(2-methoxyethyl) ether (diglyme), triglyme, tetraglyme, pentaglyme, hexaglyme, 1,4-dioxane, methanol, ethanol, propanol, butanol, ethyleneglycol, polyethyleneglycol, water, trialkylphosphine oxides, triarylphosphine oxides, trialkylphosphate, pyrazole, 3-alkylpyrazoles, 5-alkylpyrazoles, 3,5-dimethylpyrazole, imidazole, 1-alkylimidazoles, 1,2-dimethylimidazole, 2-imidazolidinone, thiabendazole, ammonia, tetramethylenesulfoxide (TMSO), urea, N,N,N',N'-tetramethylurea(TMU), thiourea, lactams, hydroxypyridines, 2-pyridone, pyridine-N-oxide, picoline-N-oxide, 2,6-lutidine, 2,6-lutidine N-oxide, pyrazine, pyrazine-N-oxide, 1,4-dithiane monosulfoxide, 2,2'-bipyridine, 1,10-phenanthroline, 2,6,2',2"-terpyridine, ethylenediamine, diethylenetriamine, 1,2,3-triaminopropane, cyclam, crown ethers and thiacrown ethers, (Y1) is chloride, bromide, iodide, thiocyanate, formate, acetate, trifluoroacetate, propionate, butyrate, pentanoate, hexanoate, benzoate, glycolate, heptafluorobutanate, alkylsulfate, octylsulfate, dodecylsulfate, triflate, methanesulfonate, nitrate, dicyanamide, tricyanomethanide, bis(trifluoromethylsulfonyl)imide (bistriflimide) or bis(perfluoroalkylsulfonyl)imide, dimethylphosphate, diethylphosphate, dialkylphosphate, saccharinate, acesulfamate and tosylate, and (X) is a counter anion consisting of hexafluorophosphate, tetrafluoroborate, bis(trifluoromethylsulfonyl)imide (bistriflimide), bis(trifluoroalkylsulfonyl)imide, dicyanamide, triflate, methanesulfonate and trifluoroacetate.