I'm a big fan of Stabillo products. I bought #88 pens, #68 pens, and a set of pastels. They all work well and have excellent pigments. That makes my work really popular. If I have an image that I want to color in a book on thin paper, I remove it as carefully as possible and use a copier to print it onto heavier paper like cardstock or watercolor paper. So I don't have to worry about the paper leaking, warping, or tearing from ink moisture. Other markers I like are Papermate (they don't often bleed through the paper) and Staedtler Fine Liner pens for fine detail. The thin Staedtler liners are particularly sleek and colorful, as are the Staedtler felt tips.
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