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The whitening effect of optical brightener agent could be estimated by visual method which better under the sunlight or measure by colorimeter. 3.light fastness there is no international standard for testing optical brightener lightfastness in plastics.most tests used din 54004 for reference.

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Professional 4BK optical brightening agent for masterbatch wholesaler in Vietnam goods of China supplier for international and neighborhood trade company.Being the most beneficial products of our factory,our 4BK optical brightening agent for masterbatch wholesaler in Vietnam merchandise series happen to be tested and won us professional authority certifications. For extra parameters and item list specifics,please click the button to have additional information.


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