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日本钢铁公司发明了一种生产七种颜色优质钢的方法。首先将钢放在硝酸中形成表面氧化层,然后用激光除掉,由光干涉效应在不同的层次产生不同的色彩。
Japanese steel company invented a method of producing seven colors of high-quality steel. First, steel is placed in nitric acid to form a surface oxide layer, which is then removed by a laser to produce different colors at different levels by the light interference effect.