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The Bath Bomb Kit box, printed with three cups of blue bath bomb mixture, a fizzing bath bomb, and badges for critical thinking, science, engineering and chemistry.
Three cups of finished blue bath bomb mixture with clear lids, stacked.
The kit laid out: a bowl, cups with lids, a measuring cup, labeled bags of baking soda, citric acid, corn starch, Epsom salt and food coloring powder, a bottle of olive oil and a craft stick.
The Bath Bombs STEM Guide, open to the materials list, the three build steps and a page explaining physical and chemical change.
The Bath Bomb Kit box beside a girl in safety glasses watching a blue bath bomb fizz in a glass bowl, with the kit materials laid out on the desk.
A girl in safety glasses pressing bath bomb mixture into a plate at her desk, with the guide open beside her.

STEM Education Series

Bath Bomb Kit

$15.00

Fizz, swirl, and splash into chemistry! Mix baking soda, citric acid, scented Epsom salt, and colorful pigment, then blend in olive oil until the mixture holds together like wet sand. Pack it into the cups and let it set. After it hardens, drop a bath bomb into water and watch it burst into a bubbly, colorful show.

Amount
Amount: Individual

The Big Idea

An acid and a base stay quiet until water brings them together.

Ages
5+Adult supervision required.
  • Critical Thinking
  • Science
  • Engineering
  • Chemistry

Safety

  • Contains small parts. Not suitable for children under 3.
  • Wear safety glasses. Do not ingest any of the materials.
  • The Epsom salt is scented with orange essential oil. Check for allergies and substitute if necessary.
  • The food coloring powder stains. Work over a wipeable surface.
  • Adult supervision required.
Three cups of finished blue bath bomb mixture with clear lids, stacked.

What’s in the Kit

  • All materials to make up to four bath bombs
  • Full color, step-by-step instructions

What you add

  • Water

Real-world connection

Why Do Bath Bombs Fizz?

Dropping a bath bomb into water looks like magic, but it is really two kinds of science at once. The swirl of color is a physical change, since the pigment simply mixes into the water. The fizz is a chemical change. Citric acid and baking soda sit quietly side by side while they are dry, but once water reaches them, they react and release carbon dioxide gas, filling the water with bubbles. Cosmetic chemists use this same science to design the bath and beauty products found on store shelves, balancing ingredients for the perfect fizz, scent, and color.

A blue bath bomb fizzing in a glass bowl of water while a girl in safety glasses watches.
A girl in safety glasses pressing bath bomb mixture into a plate at her desk, with the guide open beside her.

For classrooms

The Bath Bomb Kit is a great fit for classrooms, after-school programs, and camps. Each kit makes up to four bath bombs and arrives individually packaged with all materials and instructions included.

Purchasing for your school or program? Request a quote.

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