500 mL 0.1 M potassium phosphate buffer (31 mL of 1M K2HPO4 and 19 mL of 1M KH2PO4)
Graduated cylinder or Erlenmeyer flask
200 mL of 20% hydrogen peroxide. Note: you might set up three concentrations of hydrogen peroxide: 3%, 10%, and 20%. 20% hydrogen peroxide can be obtained from a beauty supply shop. Make sure that you get pure hydrogen peroxide and not a hydrogen peroxide containing cream used to bleach hair. A higher concentration hydrogen peroxide (30%) can also be used but it is extremely dangerous and should only be used by a trained chemist.