Mooncake Bath Bombs

mooncake bath bomb

Wondering what you can do with your mooncake molds besides making mooncakes? We had fun making mooncake bath bombs that are so pretty they can be given as gifts for those who have allergies or don’t enjoy eating mooncakes.

How to Make Mooncake Bath Bombs



  • 1 cup of baking soda
  • 1/2 cup of cornstarch (aka corn flour)
  • 1/2 cup of citric acid*
  • 1/2 cup of Epsom salt (do not use cooking salt)
  • 3 Tablespoons of coconut oil, melted (or substitute olive oil)
  • food coloring
  • essential oil (optional)*

*Citric acid is a common ingredient used in many simple science and cooking experiments.

** Essential oil adds scent and can be omitted if your child has sensitive skin.

Parenting Hack! Just use the mooncake molds with this bath bomb kit.


  1. Prep your work area: Protect your table with some newspaper or plastic. I use an old shower curtain for large messy projects. My kids use thin cutting boards for less messy activities.
  2. Combine the baking soda, cornstarch, citric acid, and Epsom salt in a large mixing bowl. With gloves on, combine the ingredients with your hands or use a small spatula.
  3. Drizzle the oil into the dry ingredients and mix well.
  4. Divide your mix into smaller bowls, one bowl for each color that you would like.
  5. Using one color for each bowl, add a couple of drops of food coloring. Mix and add more food coloring until you reach the desired color.
  6. To test your mix, squeeze some into a ball. If it holds the shape then the mix is ready for the molds. If it crumbles apart, spritz it with a little water. You can also drizzle a little water but do not add too much or your mix will foam up. Adjust the moisture until you get a consistency that will hold its shape when you squeeze some of the mix in your hand.
  7. Use your mooncake mold to make your mooncake bath bombs. Let dry overnight before using.

Tip: The mix will puff up a little so it’s best to let it sit for about 15 minutes. but this is optional. Just be aware that your first couple of bath bombs will expand a little. See the image below.

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