Some manufacturers of face cream are suspected of mixing flour into the cream. I am given 4 samples of face cream from different manufacturers. Describe what could be done to confirm that they do not contain flour.
(Oh please, help. Answer in full complete sentences. Your generous answer is much appreciated.)
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Flour will turn dark, dark blue or black when reacted with iodine, because iodine turns starch dark blue or black, and flour contains starch.
You can add some drops of iodine to your samples. If they do not turn blue or black, that shows that they do not contain starch, and therefore do not contain flour.