They're definitely not proper photo-paper type of surface, and are more designed for writing and marker pens. Couple that with a cheap inkjet printer and it's smudge-tastic.

03. Ink the lines I use a lightbox to assist me when inking the drawing onto the marker paper, done with liner pens. Make sure the pen you use doesn’t smudge with the alcohol ink.

It could also be a help to "lefties" to help them avoid ink smudge. The metal pen is available from Grand Illusions for US$29.98, a long-term investment since there is no need to replace the ink ...