Prepare a thickened starch solution by cooking any starch with water (about 25 grams cornstarch into 400 grams water) until noticeably thick; cool to room temperature. Or add instant starch to water...

Prepare a thickened starch solution by cooking any starch with water (about 25 grams cornstarch into 400 grams water) until noticeably thick; cool to room temperature. Or add instant starch to water until noticeably thick, being careful to avoid whisking air into the mixture. Do not pre-blend instant starch with sugar; this will increase the density of the solution and alter the results of the experiment.