How to design a Bath Bomb

Donald Hu


We do make custom bath bombs. Including shape, colour, scent, special ingredients, surprise on the inside and packaging.


Shape: A mold would need a very high volume to justify it’s cost.

Bath bombs should be thicker than 0.5 inches. Complex embed designs, are at risk of flaking off. 



We recommend using a 1%-2% fragrance load. When people talk about getting a bad reaction from a bath bomb, it’s usually because of the fragrance. Some ways to increase scent without fragrance concentration include air tight packaging and picking a more distinct scent instead of a subtle scent.  


Fragrance or essential?

Fragrance is cheaper and has more variety.

Essential is more expensive but it’s natural. The variety is also limited.



We use lake colours because they wash off the bath tub with a simple rinse.

Dyes look amazing as some of you see on social media but the draw back is it fades quickly, especially in the sunlight. Dyes can also stain the skin if the user holds the bath bomb while the bath bomb is reacting. The dye does wash off after a few days but you’ll hear the complaints before then!

You can use mica but in small amounts. Mica doesn’t mix well with water, it cakes on top of the water and requires soap and scrubbing to get off the tub. Activated charcoal behaves like mica but worse.


Special Ingredients.

Less is more. The most important part of a bath bomb is it not breaking. If you load a bath bomb with too much oils and butters, it’s going to get soft and mushy. Even worse, it appears hard but breaks in a hot cargo van/truck. 

Bath bomb powder doesn't stick to ingredients such as bay leaves, rosemary, etc. It’s a better idea to sprinkle your non sticking ingredient on top.



We can put your item in a bath bomb. Rings, capsules, fortunes, gemstones, we done it.  

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