Joenos Brewer's Iodine 1% Iodine Solution, 30 ml Saccharification Test

Brewer's iodine is a 1-percent iodine solution for the saccharification test. With starchy mashes, meaning grain or potatoes, you need to check whether the starch has been fully converted into fermentable sugar before the yeast takes over. That is exactly what the iodine-starch test shows you.

The steps: place a drop of the cooled mash sample on a white plate, add a drop of brewer's iodine next to it and mix. If the sample turns blue-violet, starch is still present, so keep letting it rest. If the colour stays yellow-brown like the iodine itself, the mash is fully saccharified. Never drip the iodine into the mash itself, always work only with a sample you have taken out.

You do not need this for pure fruit and berry mashes, which contain hardly any starch. The test only pays off where starch actually has to be broken down.

• Contents: 30 ml iodine solution 1 %
• For: saccharification control of starchy mashes
• Use: one drop on the mash sample, blue means starch, yellow-brown means done
• Brand: Joenos