Iodine test
Term from the Brauwerkstatt brewing glossary, category “Brewing and equipment”.
Explanation
Test for remaining starch. If the sample no longer turns blue or purple, the starch is converted.
Test your knowledge
What does the iodine test during mashing show?
- The alcohol content
- The water hardness
- Whether the starch has been fully converted into sugar
Show answer
Correct: Whether the starch has been fully converted into sugar. Iodine turns starch blue-black. If the sample stays yellow-brown, the enzymes have broken down the starch and the mash is done.
Which test shows whether all the starch has been converted?
- Forced fermentation test
- Hydrometer test
- Iodine test
Show answer
Correct: Iodine test. Iodine turns starch blue-black. If a mash sample stays yellow-brown with iodine, conversion is complete.