If I wanted to be able to add scent and package up bath salts as soon as the scent was added, what would be the best way? I was thinking using a dropper, then closing them up, but I was afraid they'd clump all up. Could I maybe pre-scent some powder (arrowroot or similar) let it dry, then sprinkle that in? Any other suggestions? Pre-scenting the salts isn't an option.