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Potatoes, like the majority of vegetables, are a low-acid food with a pH value of 6.1.

Each brand of pH test strips may have slightly different color schemes.

Litmus paper comes in two colors. Red litmus paper turns blue when exposed to a base. Blue litmus paper turns red in the presence of an acid. Litmus paper is of limited use since it only tells you whether you are dealing with an acid or base and gives no indication about strength.

Universal indicator paper would show a very light yellow. Hydrion paper would show a 'dirty' yellow.

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Q: What is the color of pH paper dipped in potato juice?
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