Glow in the dark tampons identify sewage pollution in rivers

Engineers at the University of Sheffield have found that tampons are also useful for identifying where contaminated waste water, from baths, washing machines, sinks, and showers, is polluting our streams and rivers. What makes tampons useful is that they are able to absorb the chemicals called optical brighteners that is found in most shampoos, laundry detergents, and toilet paper. The optical brighteners are visible under UV light. So the engineers found that when the tampon is dipped in water, for five seconds, containing even 0.01 ml of laundry detergent the tampon glowed.

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