Winter Science Sensory

Have you ever mixed shaving cream and baking soda? Apparently you can mix these two ingredients and end up with a moldable substance, and then you can use vinegar to “melt” what you molded. Let’s just say I winged it, so we did not end up with a moldable consistency.

But something super exciting happened when we added the vinegar to the substance... we made foam! So like any baking soda - vinegar experiment the reaction results in bubbles, but due to the added shaving cream in this mixture, the bubbles were long lived and just like foam. There was a little disappointment when we couldn’t mold it, but a lot of excitement when we realized the bubbly foam we had made.

Supplies & Instructions

Shaving Cream

Baking Soda




Liquid Watercolors (optional)

I used approximately a 1 to 1 ratio of baking soda to shaving cream. However, you don't need to measure, just dump some baking soda in a bowl and add enough shaving cream to cover the top, then mix. Transfer the mixture to the tray and add vinegar to start the reaction and make foam. If you want to use colored vinegar add a couple drops of liquid watercolors (or food coloring) to the vinegar.

Preschool Prompts

What do you think will happen when you add the vinegar to the baking soda? Before and after adding vinegar describe what you see, hear, smell, and feel. What do you think is causing the bubbles to last so long? How can we test this?

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