1. Select complementary colour for filter.
2. Make up dye solutions of different known concentrations.
3. Measure absorbance of dye solutions of different known concentrations.
4. Plot calibration graph of absorbance readings V concentration.
5. Add polymer to dye solution and measure new absorbance.
6. Repeat measurements until no further change in absorbance over period of time.
7. Use calibration curve to find out how concentration of dye changes.
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