Izibani ezikhanyayo zibizwa nangokuthi ama-optical brightening agents noma ama-fluorescent whitening agents.Lezi yizinhlanganisela zamakhemikhali ezimunca ukukhanya endaweni ye-ultraviolet spectrum kagesi;lezi ziphinde zikhiphe ukukhanya endaweni eluhlaza okwesibhakabhaka ngosizo lwe-fluorescence