Standard lead bisilicate frit.  Very low lead release.  Used in conjunction with other frits to produce glazes. Useful to encourage"rutile break" or mottle glazes.  Adding 10% china clay and/or alumina will rpoduce a glaze firing at 950oC to 1100oC.
CAUTION: Do not use lead frits with copper or barium.....toxic! (e.g. A copper brush decoration over a lead frit glaze will destabilize the glaze causing lead release.)