Tube Contents Color after 5 minutes A400 drop phenylthi0urea 19 drop H2o; 1o drops Piyeocatecnol : 1o drops trrosinase Clear O.052 1 1o dros H 20;10 Pyrocale Clear 0.016 2 1o drops Tvrosinase 20-pheny: '10 drops 3. Clear Pyrocatéchol, IO 0.013 drops Tyrosinase 1odrop Pwocatechol Darker Yellow 4 0.618

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