the stock (5 m M). 5 mls of each of the dilutions were transferred
into different test tubes and 5 ml of 0.5 mM solution of the pigment
in methanol added. The mixtures were maintained at pH of 4.2 and
their absorbance readings taken at 555 nm. The same experiment
was repeated for CrCl3 and CdCO3 with the pH maintained at 1 and
3 and absorbance readings taken at 706 nm and 682 nm respecttively.