The thing about mercury is that it accumulates, but chlorine does not. Mercury is mostly banned for being persistent pollutant, next after lead. There is no re

The thing about mercury is that it accumulates, but chlorine does not. Mercury is mostly banned for being persistent pollutant, next after lead. There is no real safe level of mercury intake due to cumulative damage and hard for body to get rid of. There is a safe, heck, required level of chlorine intake. (What is table salt?) Mercury is not any superior at measuring temperature over a resistive electronic or a bimetallic thermometer, or alcohol capillary one. (Except the latter boils and freezes too easily, not a problem for body temperature.)