The marker was in a little local, chemist store, they were trying to make a bit of money selling some magic #sharpie marker pens for £1 - thickest I've used, but with a new, fat, ink-filled, chisel-tip, so you can really put some hard pressure on it without it either blotting, or breaking, as you rip it, at high-speed, and at various angles, up steep curves, in the thick, multimedia-grade paper.
It only takes three seconds.