I was excited to use the Souffle pens in my card making, but the results have left me with a bitter taste. I tried using them on several different kinds of paper, knowing from experience with other dimensional inks that the less porous the paper, the better the results should be. Well, no matter what kind of paper and no matter how slowly I wrote or drew(the slower you write, the more ink you lay down), the results left a LOT to be desired. The pens are supposed to dry to a puffy finish -- and please note I was expecting a subtle dimensional result, nothing crazy -- but they really just dry flat like any other ink. The effect was barely noticeable. I'll be returning my set and recommend that others steer clear of this product. It's bad enough that the set is kind of pricey - they should at least deliver on the advertised effects, y'know?