TANG Lu ¹, XUAN Aiguo ², XUE Yongping ¹
(1. Department of Chemical and Material Engineering, College of Post and Telecommunications, Wuhan Institute of Technology,
Wuhan 430073, Hubei, China; 2. School of Chemical Engineering﹠Pharmacy, Wuhan Institute of Technology,
Wuhan 430073, Hubei, China)

Abstracts: The concentration of TiO₂ in irisated titanium-mica pearly pigments was analyzed by ammonium ferric sulfate volumetric method. The results show, with the increase of TiO₂ concentration, the color of the irisated titanium-mica pearly pigment changed from silvery white to golden yellow, and then to fuchsias, which tallied with the law of rainbow effect. The microscopic morphology of the pigments was also observed. The inverted fluorescence microscope found that the transmitted light color tallied with the color absorbed. The scanning electron micrographs indicated with the increase in TiO₂ concentration, the edges and corners of mica flakes were smoother.

Key words: pearly pigments; titanium-mica; coated concentration; micromorphology