I would suggest starting with DIY ink --  oil+pigment (a mason stain sounds good[1]). [2] .. and an image with some largish 100% back and 100% white areas. Everybody seems to say no to inkjet printers. Some [all?] Xerox and Laser printers produce a fused plastic image that is likely to be good at rejecting water and being receptive to oil. While inkjet inks may be water-soluble. After you've applied the gum-arabic solution and let things stand for a while you should see that th