Starch indicator is made with iodine as the main ingrediant. A chemical test for starch is to add starch indicator (iodine solution) to a small amount of your wash / wort and look for a colour change. In the presence of starch, starch indicator solution turns a blue/black colour. It is possible to distinguish starch from glucose (and other carbohydrates) using this iodine solution test.
Convenient dropper bottle.
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