PC67 River RockRIVER ROCK PC 67 Product Description The sandy, dark brown tones of PC 67 River Rock feather into a beautiful ebony before breaking into a rich amber when applied over texture. Subtle green grey honeycomb shapes appear underneath the amber breaks when this glossy glaze is applied on vertical surfaces. CONE 5 6 Safety Warning Tableware producers must test all finished ware to establish dinnerware status, due to possible variations in firing temperature