David and I ground beads all day. We finished a small hand full of beads made from Jack Danial's bottles. The glass is curious... After making frit out of the glass, and washing the glass, letting it dry, then putting it in a mold to cast, ramping up the kiln and then,... the glass goes milky. Yes, milky. not clear, but a white translucent color. Very unexpected, but very pleasing. Here is an image of the beads.