Some types of transparencies also have a white strip running the length of them. It's called a "sensing strip" and is there so that certain types of copiers can recognize a clear sheet coming through and can sort of grab onto it. The strip removes cleanly, without residue. Sometimes I pull the strip off and other times I leave it on, incorporating it into my card design.
This is a card I made for the DH. It isn't a great image because I scanned it, but trying to get a photo of a transparency is waaaaay beyond my limited photography skills. The deer is a sticker Mike had admired and looks much better than anything I could color; the zig-zag design is a gold metallic sticker over the sensing strip.
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