Method for producing colored wood

A method for producing colored wood, the method comprising:

• impregnating a block of wood with an organic acid aqueous solution containing an organic acid, wherein the wood is artificially dried wood, a moisture content of the artificially dried wood is 7% to 25%, and the moisture content of the wood is measured in accordance with the Japanese Industrial Standard JIS Z2101;
• and
• performing steam treatment at a temperature and a pressure on the block of wood in a wet state of being impregnated with the organic acid aqueous solution while keeping the block of wood in the wet state,
• wherein, in the steam treatment, the temperature is 110° C. or more and 160° C. or less and the pressure is a saturated steam pressure at the temperature, and
• wherein a thickness of the wood is 10 mm or more and 40 mm or less.