Great card stock paper is now available with a special core, one with color. This paper is super to sand, impress, tear, or work with in anyway that shows the core. What a surprise when the paper is torn for a ragged edge in your project and a hidden color is exposed.
I love core'dinations cardstock. It is so fun to tear/sand paper and get another color coming through. These papers are not the easiest to sand though so I would recommend using something like the Tim Holtz sander.