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Is there a relatively safe alternative to vinegar and baking soda for chemical reaction volcanoes?

My brother is working on a paper mache volcano experiment for school, and I figured that the instructables community has come up with something a little more creative than just vinegar and baking soda. When I say relatively safe I mean something that doesn't emit poisonous gasses or toxic waste.  Thanks for any help.

Update: I'm not worried about the safety of vinegar and baking soda, I added a safety request because I was almost very stupid mixing chemicals without checking about results. I almost created a gas used to exterminate people. There is no need to lecture me on how stupid this was, I already know.


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Google "elephant's toothpaste" for several good alternatives to baking soda and vinegar. It's really just 6% hydrogen peroxide, food coloring, active dry yeast and dish soap, though. 6% hydrogen peroxide can be found a beauty supply stores. Don't get it in your eyes. You did say relatively safe, right?

If you mix a little dish soap and food coloring in with the baking soda before adding vinegar, it makes a pretty decent foam, too.
Burf7 years ago
I can't think of anything that could be any safer than vinegar and baking soda. Other than a very small amount of carbon dioxide gas, nothing is there that you  couldn't  safely eat, if you don't mind the taste.
travisttt (author)  Burf7 years ago
Update: I'm not worried about the safety of vinegar and baking soda, I added a safety request because I was almost very stupid mixing chemicals without checking about results. I almost created a gas used to exterminate people. There is no need to lecture me on how stupid this was, I already know.
jeff-o7 years ago
Mentos and Diet Coke!!
buteman7 years ago
You could use citric acid and bicarbonate of soda.

blkhawk7 years ago
You may try salt on a cola soft drink. When I was in school that use to be one of our pranks, putting salt on a pitcher of Coke or Pepsi. The foam would cover the whole table!