bath bomb assembly

Every bath bomb or bubble bar recipe that I have ever made involves mixing your well blended dry ingredients with your oils/fragrance/poly80 or wet ingredients. Today I came across an old article in Marie Claire with photos from a Lush tour. They included photos of an employee making bath bombs...

hello - The first time I made bath bombs, I only used FO and 91% alcohol to bind the ingredients. 12 hours later, they came out of the metal molds perfectly, except for one that crumbled. Yesterday I made bath bombs and I used 30g of shea butter to bind 8 oz baking soda, 1 oz cornstarch, 4 oz...