I do not remember the exact drying time, but it was not very long. They should be able to bring them home the same day. You will want to shake off the excess baking soda mixture before transporting.

I love crayon resist. That would be a great idea.

Hello Stephanie, I have never made the eruptions with paint, but I would imagine that the paint diluted with vinegar would work as well. I would do a small test at home to make sure that it fizzes ok. I hope that your kids enjoy them. My daughter loves making eruption paintings.

Hi Oriana, A friend of mine made a bunch of these and hung them up. I would think that you should be able to frame them. You may just want to wipe them a bit with a dry paper towel to remove any baking soda residue.

Hi Alexandra, I have received a lot of questions about this experiment with mixed results.The colors will appear softer when they dry and the colors will vary each time. I have had some that are bright such as the ones pictured and also some that have come out in a more pastel tone. Results also will vary depending on the concentration of your food coloring. The coloring that I used was highly concentrated and does offer vivid results. If you are using a less concentrated food coloring, you could try an additional drop or two of color. Thank you for reaching out.