Cone 6: Shipwreck is an aquamarine gloss glaze that contains an iron crystal. As the crystal melts, a small iron speck appears. The glaze appears mysterious like underwater footage.
Cone 10: Color darkens.
*The first image is cone 6 and the second image is cone 10.
Tableware producers must test all finished ware to establish dinnerware status, due to possible variations in firing temperature and contamination.