[Sneakerphile]

Pure was right, looks like tattooing supes is a bust! The leather is not supple enough. Also, the ink stains the leather too quickly. When you get ink, the tattooist has to stop to wipe of the excess ink, but on the leather I found it was staying unless you wiped it off really quickly with a damp cloth, so just to do a small line I was having to stop every couple of seconds to wipe down, so to do a complete design would take forever. It may work better on softer leather, but then the staining would probably be even more of a problem. Still, it was worth a try.
Think the only thing would be to do design on a piece of separate untreated leather then attach it to the shoe (a collab with ghettro would be needed!)
Oh well, back to the airbrush it is then