Sakura’s line of Souffle pens are a unique product that can create 3D lines on dark paper and surfaces. I found this set of 10 pens at a local craft store and decided to try it out. When you first draw or write with it, the ink comes out clear and takes time to change color as it dries. The ink leaves a raised line that you can feel and the colors are very vibrant. They also work on surfaces such as plastic, coated paper, acetate, and vellum. They’re great for coloring in small stamped images and work great on black cardstock.