传统的漂白方法不能使天然有色蛋白质纤维得到令人满意的白度，对纤维又有很大的损伤。
Crude protein fiber can hardly get an appropriate whiteness by traditional bleaching method, with which the fiber will serious damage.
通过实验利用二价铁离子对天然有色蛋白质纤维进行预处理，可以有效的降低损伤，提高白度。
The experiment makes crude protein fiber a pretreatment with ferrous ion. It can increase whiteness and reduce the damage effectively as well.
色蛋白结合的蛋白质，如血红蛋白，包括一个有色并含金属的辅成基，如血红素。
A conjugated protein such as hemoglobin that contains a colored metal-containing prosthetic group such as heme.
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