Make up a solution standard solution of the coloured substance, Make serial dilutions of the standard solution to give at least 5 known concentrations across a range for the unknown., Measure the absorbance of light using a complementary colour filter/wavelength, Plot a calibration graph: absorbance vs concentration, Measure the absorbance of the solution with the unknown concentration, Use the calibration graph to determine the concentration of the solution..

Colorimetry method

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