This communication describes an improvement to the experiment entitled “An Inexpensive Kinetic Study: The Reaction of FD&C Red #3 (Erythrosin B) with Hypochlorite” by Maher M. Henary and Arlene A. Russell.1 The original protocol fails to take into account the effect of the ionic strength on the measured rate of decolorization of FD&C Red
#3. The modification described herein offers a significantimprovement in the experimental outcome