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This paper reports the gasochromic effect in colloidal nanoparticles of tungsten oxide dihydrate synthesized via a simple electrochemical anodizing of tungsten in an electrolyte composed of 0.02M HCl. The anodizing caused the electrolyte to convert to a light yellowish colloidal solution consisting of tungsten oxide dihydrate. The ultimate gasochromic colloidal solutions were obtained just by addition...