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Use concentrated Iodine, If parts of the potato turn blue-black, there is starch present.=Be careful - iodine is an irritant.==OBVIOUSLY, Don't eat the potato afterwards!=

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15y ago
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14y ago

Iodine KI - reagent. will turn blue if starch is present.

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11y ago

you put a small slice of potato in a tile dish, and use some sort of acid and if it turns black, it cotains starch

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Q: How do you test for starch in potato extract?
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