Vial mfiti ndiyabwino kwa ntchito yaying'ono ya batch ndi zitsanzo zokonzekera. Opangidwira kuti agwiritse ntchito labotale ndi zokutira bwino mosagwiritsa ntchito mankhwalawa, purper purper imagwiritsidwa ntchito kwambiri pa laborator mutu wolumala.