Webb25 maj 2024 · Optical brighteners, optical brightening agents (OBAs), fluorescent brightening agents (FBAs), or fluorescent whitening agents (FWAs), are chemical compounds that absorb light in the ultraviolet and violet region (usually 340-370 nm) of the electromagnetic spectrum, and re-emit light in the blue region (typically 420-470 nm) by … Webbis negative for optical brighteners. If the ratio is less than 1.5, conclude that the sample is positive for optical brighteners. Step 4. Out of the 3 replicates If all three are positive …
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Optical brighteners and antioxidants - BASF
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