Food-grade silicone lid ceramic lock mug
Food-grade silicone lid ceramic Lock Cup mug whiteness test is an important issue is how toevaluate the brightness of an article. Evaluation of whiteness has a long history, there are many formulas which express the world, there had been more than one hundred kinds of whiteness formula, has not been a unified standard, mainly due to the whiteness of the people by the naked eye, and long-term impression with a reflection of ......
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