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The white masterbatch formula in the color masterbatch often shows yellowing. The incident reflectance of titanium dioxide is less than 100%, especially the blue and purple spectrum wave end, light absorption rate is very high, so it is not pure white, but with a pale yellow hue. The fluorescent whitening agent can absorb ultraviolet light (wavelength 300-400nm), and then emit purple fluorescence (wavelength 420-480nm), so it can significantly improve the whiteness and gloss.