I have been experimenting with making scented rocks. I havent tried adding Alum yet, but used a bit of corn starch. They are taking forever to dry, so I put them in the microwave for 10 sec intervals, this seems to work fine. I am not sure I like the recipe I am using. The scent doesnt seem to last as long as I would like a, a week or so. Any suggestion would be appreciated. I love the concept, but I dont really want to waste time if this is as good as it is going to get TIA