http://www.upi.com/Archives/1987/10/13/Verbatim-introduces-Teflon-coated-floppy-disk/5095561096000/ :
The Verbatim diskette retained 95 percent of its data when smudged with fingerprints, compared to a 99 percent data loss in 3M diskettes and a 70 percent loss in Maxell diskettes, the company said.