Skittles Rainbow Ring
Colored stripes spread inward.
Teaching & key ideas
What you do: Arrange candies in ring and add shallow water.
What students see: Colored stripes spread inward.
Why it works: Candy coatings dissolve and pigments diffuse through water.
Question to ask: Why do the colors stay in lanes for a while?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: Why do the colors stay in lanes for a while?