Various aberrations in onion (Allium cepa) root tips treated with 0%, 0.001%, 0.01%, 0.1% and 1% concentration of four used food colour additives. Similar letters are representing no difference among treatments of each FCA (n = 4). Where a = dislocated metaphase; b = forwarded anaphase; c = bridge anaphase and d = laggard anaphase.