Cobblestones create a textured cobbled surface when fired. Apply over another glaze and during the firing process, a shattered pattern of raised, irregular chips will emerge.
Cone 06 oxidation (large photo): A black shattered pattern of raised, irregular chips will emerge. The underlying glaze will appear in the cracks.
Cone 6 oxidation (small photo): Glaze will bead up on the surface of the piece. If applied over another glaze the texture flattens with similar cobblestone pattern.