Nope, this is a practical, don't knock it if ya ain't tried it post.
At work I had a foreman who used an employee fingerprint ID time clock. Sometimes the scanner wouldn't read your print. We found out that a little swipe of the finger pad along your nose picked up the oil and would allow the device to read your print. I think I'll try it on a piece of carbon steel to see if it works.
This thread got me to thinking. I wonder if urine would put a good patina on my GB2.