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A coloured film was formed on SUS 304 stainless steel in an aqueous solution containing 2.5 M CrO 3 and 5.0 M H 2 SO 4 by the alternating current electrolysis method. Quantitative measurement of the colour tone and colour difference were conducted to evaluate the controllability and reproducibility of the colouring process. The chromaticity of a coloured film formed at 80°C...
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