The Iodine Test for Checking Mash Conversion

How can a brewer who uses only grains determine when the mash is finished? You can check to determine if you have a full conversion using a very straightforward chemical test. In all-grain brewing, the mash is used to transform complex malt starches into simple sugars that yeast can quickly eat. Modern, highly modified malts with a high enzyme content in 5 Gallon Homebrew Kit make it feasible to finish your mash quickly—sometimes in as little as 20 minutes. In such a case, you might not need to mash for an hour or more, but how would you know?

A simple method is the iodine test:

• Purchase some of the inexpensive liquid iodine that is sold at almost every pharmacy. Since it is marketed as an antibiotic for use on cuts and scrapes, it is often found alongside first aid supplies.

• Draw a little sample of wort from the top of your mash tun to conduct your test. To see the colour, all you need is a teaspoon-sized sample, which you should place on a white dish.

• The wort should be given a few drops of iodine. The wort will immediately become dark blue or black if there are unconverted starches present. This suggests that the mash is not entirely mixed.

• If the mash is finished, it will either be clear or a very faint shade of brown that closely resembles the wort. This shows that the mash starch conversion is finished, and the sparge may now be started.

On brew day with a 5 Gallon Brewing Kit, doing the iodine test may save a tonne of time. It is uncommon to require a complete 90-minute or even hour-long mash with current malts. A mash may frequently be finished in less than 30 minutes.

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