New This Month


Elephant Toothpaste

Make sure you and the kids have a slightly evil laugh when conducting this experiment for your haunted house.

Photography: David M. Russell

Source: Martha Stewart


Resources: 3,000mL flask available from Martha Stewart for Grandin Road. Hydrogen Peroxide Salon Care Brand from Sally Beauty Supply available from or your local beauty-supply store. All other tools and materials available at your local grocery store.


  • 3,000mL flask or empty soda bottle

  • Measuring cup and measuring spoons

  • Salon-grade hydrogen peroxide (6-8 percent by volume; 20, 30 or 40 clear developer)

  • Concentrated dish soap

  • Liquid food coloring four-pack (green, red, yellow, and blue)

  • Large tray or newspaper to protect surface from mess

  • Funnel

  • 250mL flask or smaller container of choice

  • Active dry yeast


  1. In large flask or soda bottle, mix 2 cups salon-grade hydrogen peroxide, 1 teaspoon dish soap, 20 drops each green and red liquid food coloring, and 10 drops each yellow and blue food coloring. (Tip: Standard 3 percent by volume peroxide from the drug/grocery store will work too, but with less effect.)

  2. Place flask or soda bottle in large tray or on protected surface and place funnel in opening of flask or soda bottle.

  3. In smaller flask or container, thoroughly mix 2 tablespoons yeast and 6 tablespoons warm water. Let sit for 2 minutes.

  4. Pour yeast mixture into funnel, quickly remove funnel from flask or bottle, and step back!

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