I-ejenti yokuqedela indwangu iyi-reagent yamakhemikhali yokuqedela izindwangu. Ngenxa yokuthi kunezinhlobo ezahlukahlukene, kuphakanyiswa ukuthi ukhethe uhlobo olulungile ngokuya ngezidingo kanye namamaki wokuqedwa kwamakhemikhali. Ngesikhathi sokucubungula, i-ejenti yokuqedela okuphansi yamangqamuzana ikakhulukazi isisombululo, kanti i-ejenti ephezulu yokuqedela i-molecular ikakhulukazi i-emulsion. Kanye ne-ejenti yokuqeda, i-UV absorber, i-ejenti yokuqinisa ukusheshisa kombala nezinye izinsiza nazo ziyacelwa ngesikhathi sokukhiqizwa.