Why is isn’t it chemical change if you mixed paint together?

Not all color changes indicate a chemical reaction. Merely mixing colors is a physical change. No new substance is formed.Because the physical and chemical makeup of the pigments used to make colors vary, the rate and distance at which they travel along the paper towel varies, causing the colors to separate out

Explanation:

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.