If it is a newer stone, and the yellow is glued to a bit of slate, then the slate is just backing. If it is a natural combo with BBW, then you can use the BBW. If it is an old stone glued to BBW, then... maybe. The blue stone was intended to just be a backing like slate is now, but depending on where they sourced the stone from in the mine, it might have enough garnet to work or it might not. You just have to try it.Newbie question again - Is the back of a couticle meant to be used or is it just a backing material?
Yep, so ignore the back side if it's new. It will just be Brazilian slate. Good for making coticules fatter, and tiling floors.Thank You. These are new ones, so probably just glued on (has a clean, non wavy line).