Mason absolutely loved this. Every time he poured the vinegar and it made the bubbles, he said "Whoa.."
We added some food coloring, that way we could talk about the colors.
It got pretty messy, I'm glad we were outside. Mason didn't want to stop this experiment, but unfortunately we ran out of vinegar (something that rarely happens in our house). So, we will have to make a trip to the store and try it again someday soon. This was such an easy little "project" to do and clean up. We just dumped some water on the table when we were done to wash everything away. Hopefully I can scrounge around and find more fun (and frugal) things for us to try soon.