Gently tap the mold so that the bath bomb releases and carefully lay on a towel or tray to dry.
Let the DIY bath bombs dry for 30 minutes or until they are firm and won't fall apart.
Notes
To make a round bath bomb, over-fill two round halves and press them together firmly before tapping the molds to release the bath bomb. Or you could simply package them up in pairs in an organza bag.