Examples of ceramics include white porcelain or white porcelain decorated with cobalt , copper blue underglaze , red underglaze and iron underglaze . Examples of ceramics include white porcelain or white porcelain , decorated with cobalt , copper blue underglaze , red underglaze and iron glaze . Examples of ceramics include white porcelain or white porcelain , which is decorated with cobalt , copper red underglaze , blue underglaze and iron underglaze .