I tried fiebings leather dye first. Seems like it should have worked because it is alcohol based, but it didn't work for me. So yes, I used suminagshi inks on top of straight water. I have not experienced any rub off, but I have found is that using oil after these inks is not good. It tends to fade the color. Sealing it with resolene or super shene works quite well though. It really is a fun little project.