1 Cup Citric Acid
2 Cups Cornstarch
1 3/4 Cup Baking Soda
Mix all of your dry ingredients together in a bowl. If you want to tint it a color then just add about 6 drops of food coloring to a small spritzer bottle of water. Spritz the mixture until you get the color you want. Add water slowly to mixture so it does not fizz.
Check consistency of powder with fingers. When you are able to pack the mixture then you can stop spritzing.
Add 5 drops of your essential oil and mix really well. Pack your mix into a muffin pan or bath bomb mold. Let set and dry for about 2 hours. Pop out carefully when done and toss into the bath tub.