Try a stypic pencil. That's basically alum block in a pencil shape. Just wet the stick and touch the end to your nick and it should stop the bleeding.
It needs some fixing in the picture department, but the information is good. http://theshaveden.com/forums/threads/stopping-the-flow-of-red.27542/
Then there's always the old fashioned sceptic pencil.. Low tech but it works. Got me through the seventies..