We decorated our Christmas tree this evening. During the process, someone found a long lost box of empty glass ball Christmas ornaments that they sell at craft stores. They are the kind that you can fill with whatever fun things you want.
One of the kids had the idea of filling them with colored water. This evolved into water plus other stuff. Finally, the project transformed into a density column idea where liquids of different densities are added and then separate out into colorful layers.
Colored water was pretty (especially with a little soap):
Then one of the kids thought of the layers of differing densities in a density column and wanted to try that! They put all the ingredients we had on hand in different little bowls (honey, light corn syrup, water, canola oil, and green dish soap). NOTE: Steve Spangler has a great density column project that lists ingredients you can use.
We did not have a funnel, so we used a large kid’s medicine dropper and a cool syringe-type device that my oldest daughter was given when she had her wisdom teeth out (a baby medicine syringe would work too). They both worked really well.
Honey, corn syrup, and oil with a few drops of food coloring in the oil produced some cool, elevated, lava lamp-style blobs:
The ornaments are too heavy to hang on a Christmas tree, however they make a pretty and very unusual centerpiece!