The 3rd test was the Kastle-Meyer Reagent (Reduced phenolphthalein kept in alkaline solution in the presence of zinc) test. Oxidation with haemoglobin and hydrogen peroxide will cause the colourless Kastle-Meyer Reagent to turn pink.
After adding Kastle-Meyer Reagent. Sample 4 is on the right, Sample 5 left.
It is observed that the centre of Sample 4 turns pink.
TADA. Sample 4 is the blood sample! Case closed.
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