Combine baking soda and cornstarch in a bowl. Add cocoa powder, if using for your hair color. Stir until fully incorporated.
Transfer to a jar or shaker with lid. Store in a dry place.
To Use:
Dip a makeup brush into the dry shampoo powder. Tap the brush to remove excess. Brush the powder onto your roots or areas that look oily.
Allow the powder to sit for 2 minutes.
Brush your hair to distribute the powder throughout your hair.
Notes
If using a shaker, shake the powder onto your hair very carefully. In this case, less is more. Too much powder will be noticeable. Allow to sit as above and brush as normal.Your dry shampoo will last in a sealed container for up to a year. I keep my dry shampoo in a canning jar under my sink to keep it away from the steam of the shower.