TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Method: The organic-type fuel is discharged by heating.Preferred Property: The indexical property is color.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: Alternately, the fuel contains a compound which forms a liquid organic fuel, the liquid organic fuel, a complex, or the molecular compound. The fuel contains water and/or alcohol as solvent. The concentration of liquid organic fuel is 5-90 wt.%, and the concentration of the compound is 0.001-1 mol/L. The fuel has a pH of 4-8.Preferred Compounds: The solid-like molecular compound is a clathrate compound formed from the organic-type fuel and a host compound which is held by a porous material. The host compound is organic compound, inorganic compound, and/or organic-inorganic complex compound of single molecule type, polymolecule type, and/or polymeric type. The host compound is urea, 1,1,6,6-tetraphenyl hexa-2,4-diyne-1,6-diol, 1,1-bis(2,4-dimethylphenyl)-2-propyne-1-ol, 1,1,4,4-tetraphenyl-2-butyne-1,4-diol, 1,1,6,6-tetrakis(2,4-dimethylphenyl)-2,4-hexa diyne-1,6-diol, 9,10-diphenyl-9,10-dihydroanthracene-9,10-diol, 9,10-bis(4-methylphenyl)-9,10-dihydroanthracene-9,10-diol, 1,1,2,2-tetraphenyl ethane-1,2-diol, 4-methoxy phenol, 2,4-dihydroxy benzophenone, 4,4'-dihydroxy benzophenone, 2,2'-dihydroxy benzophenone, 2,2',4,4'-tetra-hydroxy benzophenone, 1,1-bis(4-hydroxyphenyl) cyclohexane, 4,4'-sulfonyl bisphenol, 2,2'-methylene bis(4-methyl-6-t-butylphenol), 4,4'-ethylidene bisphenol, 4,4'-thiobis(3-methyl-6-t-butylphenol), 1,1,3-tris(2-methyl-4-hydroxy-5-t-butyl phenyl) butane, 1,1,2,2-tetrakis(4-hydroxyphenyl) ethane, 1,1,2,2-tetrakis(4-hydroxyphenyl) ethylene, 1,1,2,2-tetrakis(3-methyl-4-hydroxyphenyl) ethane, 1,1,2,2-tetrakis(3-fluoro-4-hydroxyphenyl) ethane, alpha,alpha,alpha',alpha'-tetrakis(4-hydroxyphenyl)-p-xylene, tetrakis(p-methoxyphenyl) ethylene, 3,6,3'6'-tetra-methoxy-9,9'-bi-9H-xanthine, 3,6,3'6'-tetra-acetoxy-9,9'-bi-9H-xanthine, 3,6,3'6'-tetra-hydroxy-9,9'-bi-9H-xanthine, gallic acid, methyl gallate, catechin, bis-beta-naphthol, alpha,alpha,alpha',alpha'-tetraphenyl-1,1'-biphenyl-2,2'dimethanol, diphenic-acid bis-dicyclohexyl amide, fumaric-acid bis-dicyclohexyl amide, cholic acid, deoxycholic acid, 1,1,2,2-tetraphenyl ethane, 1,1,2,2-tetrakis(4-carboxy phenyl) ethane, 1,1,2,2-tetrakis(3-carboxy phenyl) ethane, acetylene dicarboxylic acid, 2,4,5-triphenyl imidazole, 1,2,4,5-tetraphenyl imidazole, 2-phenyl phenanthro (9,10-d) imidazole, 2-(o-cyano phenyl) phenanthro (9,10-d) imidazole, 2-(m-cyano phenyl) phenanthro (9,10-d) imidazole, 2-(p-cyano phenyl) phenanthro (9,10-d) imidazole, hydroquinone, 2-t-butyl hydroquinone, 2,5-di-t-butyl hydroquinone, and/or 2,5-bis(2,4-dimethylphenyl) hydroquinone, preferably 1,1-bis(4-hydroxyphenyl) cyclohexane, 1,1,2,2-tetrakis(4-hydroxyphenyl) ethane, 1,1,2,2-tetrakis(4-hydroxyphenyl) ethylene, diphenic-acid bis(dicyclohexyl amide), fumaric-acid bis-dicyclohexyl amide, and/or 2-(m-cyano phenyl) phenanthro (9,10-d) imidazole. The host compound is formed by introducing a functional group of coloring property to imidazole of formula (1).R1,R2=H, methoxy, amino, dimethylamino, nitro, or halogen;R3=nitro, cyano, ethoxycarbonyl, acetyl, or formyl;R4,R5=H or group which mutually couples to form condensed ring;andR6=phenyl substituted by H, 1-4C alkyl, phenyl, methoxy, amino, dimethylamino, nitro, and/or halogen.The imidazole group compound is 4,5-bis(4-methoxyphenyl)-2-(2-nitrophenyl) imidazole, 4,5-bis(4-methoxyphenyl)-2-(3-nitrophenyl) imidazole, 4,5-bis(4-methoxyphenyl)-2-(4-nitrophenyl) imidazole, 4,5-bis(4-aminophenyl)-2-(2-nitrophenyl) imidazole, 4,5-bis(4-aminophenyl)-2-(3-nitrophenyl) imidazole, 4,5-bis(4-methoxyphenyl)-2-(4-nitrophenyl) imidazole, 4,5-bis(4-methoxyphenyl)-2-(2-nitrophenyl)-1-methyl imidazole, 4,5-bis(4-methoxyphenyl)-2-(3-nitrophenyl)-1-methyl imidazole, 4,5-bis(4-methoxyphenyl)-2-(4-nitrophenyl)-1-methyl imidazole, 2-(2-nitrophenyl) phenanthro (9,10-d) imidazole, 2-(3-nitrophenyl) phenanthro (9,10-d) imidazole, 2-(4-nitrophenyl) phenanthro (9,10-d) imidazole, 1-methyl-2-(2-nitrophenyl phenanthro (9,10-d) imidazole, 1-methyl-2-(3-nitrophenyl phenanthro (9,10-d) imidazole, 1-methyl-2-(4-nitrophenyl phenanthro (9,10-d) imidazole, 1-phenyl-2-(2-nitrophenyl) phenanthro (9,10-d) imidazole, 1-phenyl-2-(4-nitrophenyl) phenanthro (9,10-d) imidazole, 1-(4-nitrophenyl)-2-(4-nitrophenyl) phenanthro (9,10-d) imidazole, and/or 1-(4-methoxyphenyl)-2-(4-nitrophenyl) phenanthro (9,10-d) imidazole. The other compound has a functional group of coloring property. The compound which forms liquid organic fuel, complex, or molecular compound is sulfuric acid, sugar, alcohol, amine, and/or strong electrolyte, preferably crown ether, cryptand, cyclophane, azacyclophane, calixarene, (cyclic) oligopeptide, urea, thiourea, deoxycholic acid, perhydro triphenylene, spirobi fluorene, cyclo phosphazene, hydroxy benzophenone, phenol, bisphenol, trisphenol, tetrakis phenol, polyphenol, naphthol, bis naphthol, carboxylic acid amide, thioamide, carboxylic acid, and/or hydroquinone. Preferred Fuels: The organic-type fuel is alcohol, ether, hydrocarbon and/or acetal group fuel, preferably methanol, ethanol, n-propanol, isopropanol, ethylene glycol, dimethyl ether, methyl ethyl ether, diethyl ether, propane, butane, dimethoxy methane, and/or trimethoxy methane. The liquid organic fuel is alcohol, ether, cycloparaffin (having hydrophilic group), and/or substituted product of cycloparaffin, preferably methanol, ethanol, propanol, dimethyl ether, cyclohexane, cycloparaffin having hydroxyl, carboxyl, amino or amide group, and/or mono-substituted component of cycloparaffin.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The fuel composition contains a polymer compound formed by polymerizing or co-polymerizing a structural unit having a carboxyl group and/or sulfonic acid group in the molecule. 30-100 mol% of the proton of the carboxyl group and/or sulfonic acid group of polymer compound which is 20-100 wt.% of the structural unit is substituted by an onium cation. The onium cation is a quaternary ammonium cation chosen from aliphatic group ammonium cation, imidazolinium cation, and imidazolium ion. EXAMPLE - 1,1-bis(4-hydroxyphenyl) cyclohexane (26.8 g) was heat-dissolved in methanol (50 ml), and re-crystallized to obtain a methanol clathrate compound in solid form. The methanol content rate was 11 wt.%. Vaporization of methanol was prevented, and danger during preservation was improved by clathration. The deleterious substances were also removed by clathration. The vaporization discharge temperature was controllable. The discharge temperature of methanol from the clathrate compound, by heating, could be freely changed.