Funny Elephant Toothpaste (Chemical Reaction)

you may find related materials in here:
35% hydrogen peroxide:
Dry yeast:
Potassium Iodide:
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If we need to choose top 10 most interesting chemical reactions, I think elephant toothpaste must be one of them.
Elephant toothpaste is a very easy and funny science experiment, which results in a rapid eruption of huge amount of foam. In the past few years, I have performed this experiment with my kids over 50 times.
Things we need:
Level 1: beginner level
-10% hydrogen peroxide
-food coloring
-dish soap
-yeast
Level2: Intermediate level
-20% hydrogen peroxide*
-food coloring
-dish soap
-saturated potassium iodide
Level3: ultimate level
-35% hydrogen peroxide*
-food coloring
-dish soap
-saturated potassium iodide
*20% or above hydrogen peroxide is highly corrosive, please wear glove when you deal with it
Elephant toothpaste is the decomposition process of hydrogen peroxide, while yeast / potassium iodide works as a catalyst to break down the hydrogen peroxide into oxygen and water. Soap will then mixed with the oxygen and water, which turn into foam.