Scientific analysis reveals that the colors were derived from ocher and other ironoxides ground into a fine powder.
科学分析表明,这些颜色是源自赭石和其他铁氧化物磨成的细粉。
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The project, which covers about 2,000sqm, is a monolith of concrete pigmented with ironoxides, completely decorated with a bas-relief engraved with the letters of the alphabet.