Here is a tip from a listener:

Baby talc--a very soft mineral, magnesium silicate. (Not baby powder with corn starch.) It is more easily available than DE, smells good, is non-toxic, matches white window sills better, comes in a handy dispenser and best of all it works! I had sugar ants in my kitchen and a friend from Mexico advised me to use baby talc in the window sill. I was surprised that even my mom and dad had never heard of it, perhaps you have not either. In an ant invasion emergency, even the more expensive body talcs can be used if you don't have DE or baby talc on hand. Darla, Dallas.