I stopped by a local Chinese grocer today, and in the middle of the soup aisle was "white alum" chunks in plastic packaging. I grabbed a 227g bag of 3 large chunks for 89 cents! (take that AoS's $18 alum block). My curiosity hit me though as to why it was with the soup. I know people use it for deodorant and aftershave care, but what else? Are people using this stuff in their food?