Optical Brightener Agent ER-I ke motsoako oa lik'hemik'hale o sebelisoang liindastering tse fapaneng, ho kenyeletsoa masela, lihlapa, le ho etsa pampiri. Hangata e bitsoa "fluorescent whitening agent" kapa dae ea fluorescent. Ba bang ba na le Moemeli oa Optical Brightener DT, Optical Brightener Agent EBF.