This is a RAKU design. It is made with Raku clay and heated in a kiln until.it is 1850 degrees f. It is taken out when orange hot and laid into a bed of pin needles to burn it. The burning process creates metallic and copper accents within the glaze. These pieces are not food safe and should be hand washed with a damp cloth as the glaze could fade away if scrubbed hard. These pieces are great for eye popping color in any home.