Fritted source of calcium. Lagunaclay.com says: "Similar to CC254, but without the barium. Primarily use in floor tile glazes."
Used with other frits for cone 06 to 1.
Works well for satins and chrome tin colors because of the high CaO.
Frit Frits are made by melting mixes of raw materials, quenching the melt in water, grinding the pebbles into a powder. Frits have chemistries raw materials cannot.
Frit A frit is the powdered form a man-made glass. Frits are premelted, then ground to a glass. They have tightly controlled chemistries, they are available for glazes of all types.