Izitsha zokugcina izikululu zifanele ukupakishwa kwezinhlobonhlobo zemithi ehlukahlukene, amakhemikhali anenani eliphakeme, ama-reagents amakhemikhali, ama-biological reagent, izimonyo, ama-essence namafutha, njll. Ifanele ukugcinwa nokuthutha isikhathi eside kwemikhiqizo, futhi inomsebenzi omuhle kakhulu wokuvala.