Engineers at the University of Sheffield made the decision . People glow under artificial light when they have inhaled detergent . This allows engineers to work out where pollution is coming from . Innovation helps stop sewage being accidently shunted into rivers .
Engineers at the University of Sheffield made the discovery . Tampons glow under UV light when they have absorbed detergent . This enables experts to work out where pollution is coming from . Innovation could stop sewage being accidently shunted into rivers .