Thanks Rusty & Stinky, that makes plenty of sense. (And I'm glad to know I can keep disregarding that nuclear waste dump in my backyard! :jointsmile

Also, I use a matchbox with a piece of emery board inside to scuff my beans...so there was no science behind that logic. Just something I had seen done before. But from here on out I'll make sure that if I'm going to keep doing it, I do it in the right place.

Thanks again for clearing that up.