The paper then " develops " a color-coded response to the enzyme-- similar to ph paper.
2.
Sourness is a measure of acidity-so " perhaps " you could distinguish them by testing the juice with some pH paper or indicator?
3.
Inventor Mike Reimer got the idea after years of watching his colleagues tape pieces of pH paper and a military litmus paper called M8 to their hazardous materials uniforms, which resemble a spacesuit.
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