Iodine Solution

Key Stage 3

Iodine Solution is a solution of potassium iodide and iodine in water.

Starch can be detected using Iodine Solution.

1. A small sample of food is placed on a spotting tile.

2. A drop of Iodine Solution is added to the food sample.

3. If the Iodine solution turns from orange to blue-black then the food contains starch.


Iodine solution is an orange liquid. When the iodine solution is added to starch the iodine solution turns from orange to blue-black.