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There are several ways to handle a dome head without causing it to collapse when firing to bisque. Set the head on its top. It can be held in place by using silica sand (follow precautions when using the silica sand), or silica prop. You can also use kiln shelf posts on its side with prop where the greenware stouches the post. This will hold up the head. By having the opening up, gasses and heat are allowed to escape without putting stress on the piece.