I'll add this to your comment since it's much better than the one I'd written; Dancesafe sells DIY kits for certain chemicals as well -- http://dancesafe.org/pr

I'll add this to your comment since it's much better than the one I'd written; Dancesafe sells DIY kits for certain chemicals as well -- http://dancesafe.org/products/testing-kits http://dancesafe.org/products/testing-kits