Coal Black CR 901 dry crystals.  1 ounce jar.

Manufacturer's Directions

Apply the crystals by placing them in the desired location on the piece while the last coat of glaze is still wet. With glase still on your brush dip into crystals and apply to piece. Recommended for use with CFE glazes hat fire to cone 04/06 (1830 to 1940 degrees F). They can be used successfully at any temperature. The crystal will flow into the base glaze when fired. Food safe when added to glaze and fired to witness cone 06.