Chemistry! Does what it should do. Brewed a porter last month, had I not done the iodine test, I would have boiled only a partially converted test. Fortunately, a drop of iodine indicated when my mashing completed starch conversion, the ultimate result was a wonderfully finished product. Most easily seen over when wort is placed in a white bowl, then put a drop of iodine.
Reviewed by: Ethan from on 2/27/2016