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“自然发色法”系英国“伯明翰”研究所开发,“英科”(INCO)公司专利。其原理是科用不锈钢表面形成的透明氧化膜,当入射光与反射光在表面产生干涉时而发色。当改变膜层厚度0.15～0.4微米时,便可获得各种颜色。这种方法与“涂覆”法的不同处,在于不失去不锈钢表面特有的光泽,避免高温处理和复杂设备的添置。如熔融盐法,便必须将温度提高到重铬酸钠或重铬酸钾的熔点以
“Natural hair color method” is the British “Birmingham” Institute, “British Branch” (INCO) company patents. The principle is the use of stainless steel surface with a transparent oxide film, when the incident light and reflected light interfere with the surface when the hair color. When changing the film thickness of 0.15 to 0.4 microns, you can get a variety of colors. The difference between this method and the “coating” method is that it does not lose the unique luster of the stainless steel surface and avoids the need for high temperature treatment and the addition of complicated equipment. As with the molten salt method, the temperature must be raised to the melting point of sodium dichromate or potassium dichromate