For this recipe, I am using ingredients that are pretty common, or easy to find in most areas. Essential oils can be found in small amounts at places like health food stores and craft stores often carry essentials and fragrances. Just make sure, if you buy fragrance oil, that you are buying "body safe" oils and not stuff for candles or oil warmers.
So, let's start with a basic recipe in two parts.
Dry ingredients: (By Weight, as measured on a scale.)
- Baking Soda - 8 ounces
- Citric Acid - 4 ounces
- Corn Starch - 4 ounces
- Salts - 4 ounces ( in these pictures, I used Dead Sea Salts, but mineral salts work too, and are easier to find and significantly less expensive.)
- Water - .75 tbsp
- Essential or Fragrance Oil - 2 tsp (for these I used a Ginger Peach.)
- Oil - 2.5 tbsp (I used cherry kernel, but any light vegetable oil will work.)
- Food coloring - 1 or 2 drops. (Your color will look very dark in the emulsion, but will be light in the fizzies, so as to not leave rings around the tub. For this batch I used one drop red and two drops yellow. The final result will be very light peach.)
Step 1: Blend the Dry Ingredients
Step 2: Mix liquid and blend dry and liquids together
Step 3: Try to avoid creating volcanoes
Step 4: Mold quickly
It takes a little practice to get a feel for how much filling you need, so don't get discouraged if your first couple fall apart. Here we see Igor holding a filled ball and wondering about child labor laws.
Step 5: Unmold and let dry
You can use all sorts of things to make your bombs; muffin tins, ice cube trays, candy molds, Aunt Magnolia's denture case . . . whatever makes you happy.
This batch didn't make quite enough for five bombs, and the humidity levels made the batch start to puff up, so I quickly stuffed what was left of the batch into my "bath cookies" mold. Note: When using things like silicon trays that surround the seltzer mix, or any mold with a lot of details, the mix must stay in the mold until dry, or it will crumble when you try to take it out.
Once they are completely dry, store bath bombs in an airtight container or bag. High humidity will make them activate. Because we used oil and water and no preservatives, you want to use them within about 6 months. Assuming you can keep them for that long. Igor demands payment in immediate fizzy baths, but you may have better luck actually getting to *use* yours.
When you're ready to use one, just drop it into a warm bath, and relax.