Dry Ingredients:

1 cup baking soda
1/2 cup citric acid
1/2 cup corn starch

Mix dry ingredients until you get a nice smooth blend. (If environment is a humid area, you can add 1/3 cup sea salt or Epsom salts.)

Wet Ingredients:

2 1/2 Tbsp sweet almond oil or jojoba oil
3/4 Tbsp water or hydrosol
1/2 to 2 teaspoons essential oils or fragrance oils (depends on how strong you want the odor)
1/4 tsp Vitamin E oil (optional)
1/4 teaspoon borax (an emulsifier)
vegetable or other natural colorant if desired

Combine all the wet ingredients and borax in a jar and cover the jar tightly - shake vigorously. After it is thoroughly mixed, then slowly drizzle the mix onto the dry ingredients and blend thoroughly. Pour slowly or the dry ingredients will start to fizz!  After mixing the dry and wet ingredients, pack tightly into molds, let sit for about 30 minutes and then slide the molded forms out.  Allow the molded bath bombs to dry at least twenty-four hours.

Helpful Hints:

Since this mixture is extremely dry and crumbly, you'll have to pack it into the molds quite firmly or it won't keep its shape when unmolding. If you add any other type of ingredients - including the Epsom salts, you may find that you need to add a bit more oil, but if you add to much it will make it too liquidy and it will melt in the bathtub too quickly and quite likely cause too much of a mess. When packing the molds, the mix should feel like damp sand and stick together in your hand.

Molds and Packaging:

These 'bath bombs' can be molded into various molds - from round to shaped molds - your imagination can run wild. After unpacking the molds and after they have completely dried (even sometimes a whole week!) you can then package them in pretty colored cellophane wrappers or put a few in a pretty decorated basket.