Sikhiqiza izinhlobo eziningi ze-OBA, i-agent emhlophe ye-fluorescent.I-Optical Brightener Agent BBU, eyaziwa nangokuthi i-fluorescent whitening agent BBU, iyinhlanganisela yamakhemikhali esetshenziswa ezimbonini ezahlukahlukene ezifana nezindwangu, amaphepha, namapulasitiki ukuthuthukisa ukugqama nokuba mhlophe kwemikhiqizo.