1 Pour 2-3 cups of baking soda into a baking tray and spread out evenly, breaking up any large clumps with your fingers.
What you’re looking for is a difference in texture. Baking soda is lighter and finer with a crystal-like sheen, and it has a smooth, slippery quality to it. Washing soda, on the other hand, is duller and grainier.
If you’re really having trouble telling them apart, keep some baking soda aside and run both powders through your fingers after “cooking”. Once the washing soda has cooled down, you should be able to feel the difference.
1 cup washing soda
60ml liquid castile soap
1 cup baking soda
2ml lavender essential oil or oil of your choice