Ama-vials wokugcina alungele ukufakwa kwemiphakathi ehlukahlukene yezemithi, amakhemikhali angezwe aphezulu, amakhemikhali amakhemikhali, ama-realogical, ama-expection kanye namafutha okugcina imikhiqizo, futhi enokusebenza okuhle kakhulu kwemikhiqizo.