"Light" "extinction" of polyester chips

In the market quotation of polyester chips, we often see the words "big bright", "semi dull"  "bright". What is said here is for the content of titanium dioxide (TiO2) in polyester chips.

The content of titanium dioxide in polyester chips of "big bright" (Yizheng Chemical fiber also known as "super bright") is zero; the content of titanium dioxide in "bright" polyester chips is about 0.10%; the content of titanium dioxide in "semi dull" polyester chips is (0.32 ± 0.03)%; the content of titanium dioxide in "full dull" polyester chips is 2.4% - 2.5%.

: Alibaba