Tools and Materials
1/2 cup citric acid
1 cup baking soda
3/4 cup cornstarch
1/4 cup organic cane sugar
About 6 drops food coloring
10 to 15 drops essential oil(s)
Special equipment: 2-ounce travel-size spray bottle, plastic pipette, silicone ice-cube tray, storage jars
Directions
1. Stir together citric acid, baking soda, and cornstarch in a glass measuring cup.
2. Pass mixture through a fine sieve or a flour sifter into a mixing bowl. Stir in sugar.
3. Fill spray bottle with water, and add food coloring. Spritz mixture lightly (it should become damp but not fizzy) until you can pack mixture with your hands.
4. Using pipette, add oil, 1 drop at a time, until strength of scent is to your liking. Using a metal spoon or your hands, mix ingredients until color is even throughout (mixture will begin to dry out; when this happens, spritz until packable again).
5. Spoon into ice-cube tray, pressing firmly. Let dry at room temperature overnight. Pop out of tray gently. Transfer to jars.
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