Emboss resist is such a fun technique, and the Shimmery White card stock is perfect for watercoloring.
It reacts differently than regular watercolor paper. It’s really smooth, so the stamped images are very crisp and clean. It also accepts water & reinker well, and doesn't pill like regular cardstock. The colors stay vibrant, and there's a delicate shimmer on both sides that just adds such a nice effect. Using Stampin' Up! reinkers with an Aqua Painter is such an easy way to watercolor.