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URGENT! Reversibility of Lugol's solution-starch reaction

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I've got an urgent question. Presence of starch in various specimens can be revealed by adding Lugol's solution to them. It (potassium iodide if I'm not wrong) reacts somehow with starch (actually how?) and turns the specimen dark blue. Now, the question is wheather this reaction is reversible or not? I mean if I add saliva (which contains an enzyme amylase decomposing starch) to a starch specimen (e.g. a piece of a potato) treated with Lugol's, will it still decompose the starch (and thus make the blue colour disappear) or will starch structure be distorted by Lugol's so that the amylase won't work? Any help would be appreciated.

Edited by Magru

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