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You need citric acid to make this DIY. It occurs naturally in citrus fruits. You can usually find the powdered kind in the canning aisle at the supermarket.
To prevent your bath bomb from crumbling make sure to press the mixture down firmly when you fill your molds and give the bath bomb enough time to dry (at least overnight). Hope this helps!
I'll see if I can upload a video. This bath bomb definitely doesn't stain your bath tub, hair or skin. The amount of food coloring is way too small for this. It only colors your bath water a pretty blue color!
I have edited the ingredients list and instructions. Thanks for the feedback.
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