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Why do Optical Brightener OB-1 have two exterior colors?

In the production process, if the PH＞7, yellow color appears; if PH < 7, green appears

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Which model is recommended for coating?

Optical Brightener OB 184

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Which model is recommended for ink and painting?

Optical Brightener OB boutique.

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Which model is recommended for foaming EVA?

Optical Brightener KCB FP-127

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Which model is recommended for outdoor plastics?

Optical Brightener KSN

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Which is the highest temperature-resistant whitening agent among plastic whitening agents?

Optical Brightener OB-1 ,KSN,KSB

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