Which of the following materials is traditionally used in the raku firing process?

The traditional raku firing process primarily involves the use of clay. Raku is a Japanese ceramics technique that was historically used for creating tea ceremony ware. In this method, pottery is typically made from a special type of clay that can withstand rapid temperature changes.

During raku firing, the clay pieces are heated in a kiln to high temperatures and then removed while still hot. They are usually placed into combustible materials like wood shavings to create a reduction atmosphere that affects the glaze and surface of the pottery. This unique process results in distinctive surface qualities, textures, and colors due to the smoke and chemicals released from the burning material.

While wood shavings do play an important role in creating the effects desired in raku pottery, the core material used for crafting the raku pieces is indeed clay, making it essential for the raku process.