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Message: <blockquote data-quote="Kzach" data-source="post: 4373039" data-attributes="member: 56189">Assuming this is a cardboard product with a plastic overcoat on a white paper background, I'd recommend a ball point pen, preferably one with no ink left.It has to be a thick line ball point pen so that it doesn't cut into the product even if you press hard.With a nice straight-edge (metal rulers are best), score the cardboard deeply (but not deep enough to actually cut through the thin plastic coating). Then use a whiteboard marker and go over the lines.What happens is that the ink from the whiteboard marker fills in the deep grooves and only comes off if you really get into it and scrub out the grooves. And even then, the grooves are deep enough to see even in low light.</blockquote>