颜色是物体发出或反射不同波长的电磁波决定的，是人类的视觉的感受，某些离子呈现出不同的颜色，是其内在化学特性决定的。
方法用溴麝香草酚蓝同川芎生物碱形成稳定的有色离子对酸性染料比色法测定总生物碱的含量。
METHODS Acidic dye colorimetry with bromothymol blue as ion pair reagent was employed to determine the alkaloids in samples.
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.
等离子体微弧氧化是一种直接在有色金属表面原位生长陶瓷膜的新技术。
Plasma micro-arc oxidation PMAO)is a novel technique, which can in-situ form the ceramic coatings on the surfaces of some non-ferrous metals.
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