Mix the citric acid powder, soda powder and cornstarch in a specific proportion, add the pigments and the essential fragrance oil and other materials in them. Put in the mould to give the shape, then you will have effervescent, aromatic and colorful balls of bath salt. Content: citric acid powder, powdered soda, cornstarch, edible pigments, mold, glycerine, essential fragrance oil and pipette.