CBS-X is an optical brightening agent (OBA) used primarily in the textile and paper industries to enhance the appearance of products by increasing their whiteness or brightness. It works by absorbing ultraviolet light and emitting blue light, which compensates for the yellowish hue often present in these materials.
https://www.echemi.com/produce/pr2508111562-optical-brightener-cbs-x-yellow-green-powder-or-granule-rc00074.html

Optical Brightener CBS-X Yellow-green powder or granule RC00074

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