Before revision: Toilets are a common kind of vitreous china fixture Vitreous china is an enamel coating that is applied to ceramics, particularly porcelain, after they 've been fired, though the name can also refer to the finished piece as a whole.
After revision: Toilets are a common kind of vitreous china fixture Vitreous china is an enamel coating that is applied to ceramics, particularly porcelain, after they have been fired, though the name can also refer to the finished piece as a whole.