Have some vases (or test tubes to be exact xD), you need to take care of the liquids of the mist color! You can transfer water of different colors from one vase to another only if the other vase is empty or your top water layer is the same color as the one going to the water.
The selected glass will be resaltará to avoid any confusion. The control button will allow you to return to the start of the level, also every time you open the same level the water will be barajará.