Hi! So I have more...well oily or sweaty hands. So occasionally when I'm handling old pages with heavily saturated inks like, KWZ IG Turquoise, Diamine Sargasso Sea, even random inks like Noodler's Apache Sunset, I'll find that the ink has transferred to my hands and has smudged all over the pages. Back in highschool, I vaguely remember my art teacher (been graduated for 4 years or so) teaching us a trick to prevent ink or graphite smudging. I think it was like spray hairspray over the page? I'm not sure. Does anyone know any thing that can be put on paper as a thin layer to prevent late ink smudging?