Isu tiri kugadzira akawanda marudzi eOBA, fluorescent whitening agent. Optical Brightener Agent BBU, inozivikanwawo sefluorescent whitening agent BBU, ikemikari inoshandiswa mumaindasitiri akasiyana semachira, mapepa, uye mapurasitiki kuwedzera kupenya uye kuchena kwezvigadzirwa.