Bath Bombs (Fizzies) Dry Ingredients: 1 cup baking soda 1/2 cup citric acid 1/2 cup corn starch Sieve dry ingredients until a nice smooth blend is achieved. Wet Ingredients: 2 1/2 TBSP sweet almond, sunflower, corn or other light oil 3/4 TBSP water 2 tsp. fragrance oil 1-5 drops soap colorant 1/4 tsp. borax Combine wet ingredients and borax and mix thoroughly. Slowly drizzle onto dry ingredients and blend completely. Pack tightly into molds and slide out onto wax paper. Let dry overnight.