I have recently come across this debate in a few of the theatres I belong to...when I label my gels I use a china marker pencil and I label the number smack in the middle of the gel so that while it's framed you can easily read what number gel is in it without having to pull the gel out to read the number this comes in handy when dropping gel into fixtures or when you're trying to identify the number if it's burnt so you can go pull another on. I believe there's no signifiant reason you should label in the bottom corner. It's just annoying. Anyone feel differently and why? Do you think it burns the gels any faster?