I would be interested to know if iodine tests are a reliable way to know that all the starch has been converted to sugar.
For instance, is it a good way to know if after 30mn of mash-in all the sugars have been converted? Is there a risk of false negatives? false positives?
Please note that this question is different from this one because I'm not asking if iodine tests are useful in practice (I do not use it for now and never felt that I had to) but I would rather like to know if they work effectively.