The photo-activities of different type of TiO 2 for cosmetics use had been measured by colorimetric method on the base of the mechanism of their photo-reaction.
从光敏反应机理出发，用色差方法评估了各类化妆品用二氧化钛的光活性。
2
Several problems in determinating hexanoic acid by colorimetry was analyzed, factors which influence col-or reaction were studied, the resonable colorimetric method was introduced.