I've always admired other eco-printers paper prints and have experimented a little.  But, now, I am obsessed.  Of course, paper, especially high quality paper, is made from cotton or linen fibers - textile!  Even the other cellulose fibers that make up most paper are dyeable as well.  If I expect them to be dyeable, I need to mordant them.  I have an enormous restaurant stock pot out in the greenhouse at the studio filled with a some alum (half potassium alum and half aluminum acetate) several vinegar-ed rusty items and two corroded copper pipes.  Soak for 24 hours.