If you place a potato on an piece of unprinted paper in the microwave oven, the potato would heat up, the paper would not.
A potato wrapped in paper will cook in a microwave oven, because paper does not block microwaves. A potato wrapped in aluminum foil would not cook in a microwave because aluminum foil does block microwaves.
Stick it back in the place where you put unprinted paper.
It turns blue.
Nothing - red litmus paper indicates the presence of bases.
Blue litmus does not change when placed in a basic solution.
It maintains its original hue. When placed in a base (metal oxide+water), it will turn blue.
If you mean a hot potato, then yes, you can wrap it in paper towels. Why? Because it's small enough. You can wrap anything in paper towels if it's small enough.
Potato
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Mauve on the pH paper Merck art. 9565.
potato potato ching chong tomato
When litmus paper is placed in Pepsi it will turn red. This is because litmus paper contains carboxylic acid which is acidic.