<prompt> Burtonian line is seen in?MercuryLeadArsenicZinc  <response>: Ans. is b i.e., Lead o Burtonian line is blue line, which is seen on upper gums in lead poisoning.o Similar blue line but not called burtonian line in these cases is also seen in poisoning with Mercury Hg, Copper Cuy Silver Ag, bismuth Bi, andiron Fe. 