We have several crews here at thesoapguy that make thousands of bath bombs a day. I asked them if they would share some tips for other bath bomb makers. We get many questions a month and the occaisional visitor looking for the secret sauce to bath bomb making.
There are many factors that contribute to the making of a quality bath bomb and our generous staff agreed to share some tips.
Part 1 Ingredients
1. Ingredients make a difference. Over the years we have tried just about every brand of baking soda and the best performing brand is Arm & Hammer. It seems to make a significant difference in the bombs cohesiveness. Getting your bath bombs to stick together and stay stuck together is a real treat. Arm & Hammer will do the job.
2. We use two different types of citric acid. Fine powder and ground are mixed 50/50 for the citric acid portion of the recipe. We are not sure why this makes a difference but it consistently does. The fine powder also helps with the appearance of the bomb as it gives a smoother feel and look. The ground citric acid can be harder to find than the fine, though most candy making suppliers will have some.
3. After trying many recipes we have found two ingredients that do not help your bath bomb stay together. Both ingredients are found in many recipes. Salt(Epsom salt or sea salt) and corn starch. Both ingredients inhibit the chemical reaction that occurs when you add water which in turn binds the bomb together. We add a small amount of sea salt to our recipe as our customers prefer to have it in the ingredient deck, but we do not recommend it. If you must add it, add it sparingly.
Part 2. Procedural bath bomb making tips coming soon.
Please share these tips so other crafters can have bath bomb making success in there future.