What Makes Clay Gray

Clays that are tan, brown or brick in color contain iron oxide (terra cotta and stoneware) as the coloring agent. Clays that lack iron oxide are gray to white in color (porcelain).

What makes grey clay?

Clays that are tan, brown or brick in color contain iron oxide (terra cotta and stoneware) as the coloring agent. Clays that lack iron oxide are gray to white in color (porcelain).

What type of clay is gray?

Stoneware clays are plastic and are often grey when moist. Their fired colors range from light grey and buff to medium grey and brown. Fired colors are greatly affected by the type of firing. Mid-fire stoneware clay bodies are formulated to fire to maturity between 2150 F and 2260 F (1160 C and 1225 C).