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Discovery bottles- Only use Gatorade or G2 bottles for the sensory bottles they are a heavier plastic so they hold up better and keep a unison look so everything looks good.Make sure to ALWAYS seal your bottles securely with hot glue around the top of the lid.
Going to try this sounds like fun! You don't have to wait millions of years to turn coal into a beautiful gem. Watch coal turn into crystals right before your eyes! While you're at it, take time to explain how diamonds are formed: he'll be surprised to learn that natural material, such as peat, is compressed over years and years into carbon-rich coal, and then into crystals!