why is a patch of blue black colour form if a drop of iodine falls on your starched white shirt
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a patch of blue black is formed of a starched t-shirt if iodine falls on it as starch turns iodine blue black.
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iodine is sensitive to starch or glucose or polysaccharides, therefore it reacts with glucose to form blue-black patch... if it is destarched then it would form brown coloured patch
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