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Ugly yellow sweat stains may be no match for blue LED light | The blue light was most effective at removing yellow squalene stains, without damaging the fabric
Not to sound like a TV commercial or anything, but … how often have you had to throw out white shirts because of unsightly yellow underarm stains? Well, those stains may not be a problem any longer, thanks to a simple blue light treatment.
Yellow armpit stains in white clothing are typically caused by oleic acid and an organic compound known as squalene, which are found in our sweat and skin oils. Stubborn yellow stains can also be caused by natural pigments such as lycopene and beta carotene, which make their onto our clothing in spilled beverages like tomato and orange juice. All of the samples lost color due to a blue-light-boosted photobleaching process, in which oxygen in the air broke chemical bonds within the substances, converting them into colorless compounds.
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