How to Color Bath Bombs

There's nothing quite like dropping a bath bomb in the tub and watching the color fill the water. It's easy to get the same experience with handmade bath bombs. Learn how to use micas and natural colorants below!


These are a popular option because they mix in easily and there are plenty of colors to choose from. Just add them right to the dry powder and stir. Start with about 1/8 teaspoon and go from there. Keep in mind, the more color you add, the more likely it will stain the tub. We recommend using no more than 2 teaspoons of mica per pound of bath bombs.

You can also use them to paint on bath bombs. Mix 1 part color with 3 parts 99% isopropyl alcohol. Test the consistency on a paper towel and adjust as necessary. Then, use a fine-tipped paint brush to add details. 

Powdered colorants are oil based, so they can pool on top of the water and get on your skin. To help, we highly recommend polysorbate 80. It's an emulsifier that mixes the colors into the water. Start with about 0.2 ounces per pound of bath bomb mixture.

art0140 color bath bombs mica paint

Natural colorants

You can use clays and other natural options for your bath bombs. They add a rustic hue and they help the bath bombs hold their shape. Treat them the same way as micas - start with 1/8 teaspoon in the dry powder and mix well.

Clays naturally absorb moisture, so you may need to add extra oil or witch hazel to get the right molding consistency. 

Keep in mind, when you add clay you're essentially creating mud in the water. It will cling to the tub and your skin. You can add polysorbate 80, and it also helps to wipe down your tub before use so the clay doesn't stick to any residue. 

Not recommended for bath bombs

Pigments don't work well for bath bombs. They don't mix in well and they can leave streaks of color on your bathtub and skin. We also don't recommend Lab Colors. They're water-based dyes, so they can cause your bath bombs to start fizzing too early. 

Ready to get started creating your own bath bombs? Find project inspiration here!

art0140 color bath bombs project inspiration