Things Required:
1/4 teaspoonful of flour
Tincture of Iodine
Saucer
Tablespoon
Directions:
Place 1/4 teaspoonful of flour in a saucer. Add 3 tablespoonfuls of water and stir. Add three or four drops of the Tincture of Iodine.
This Is What Happens:
The combination of starch and iodine produces an intense blue-purple colour.
Science Behind It:
Starch is a very large chemical molecule. It looks like a long twisted chain with many branches sticking out. This long twisted chain is thought to capture the iodine inside its spiral pattern. The spiral of starch with iodine caught on the inside produces the colour.
