This iodine clock reaction happens so fast it looks like magic

The iodine clock is a common chemistry experiment in which two clear liquids are mixed together to produce a dark, opaque color. But as you'll see in this video, the speed at which this reaction happens is nothing short of remarkable.

This effect is the result of two different reactions, with one being exhausted more quickly than the other. The experiment can be run a number of ways; typically, the first liquid is comprised of hydrogen peroxide and sulfuric acid, while the second consists of potassium iodide, sodium thiosulfate, and starch.