Chemicals

Terra sigillata is a very smooth, lustrous coating of clay which resembles a glaze and is virtually waterproof. The name means “sealed earth” and has been used to refer to the Classical Greek Attic black-figure and red-figure painted pottery. These days, the name terra sigillata is used to refer to an especially fine coating of clay applied to a ceramic piece. For centuries the secret of making terra sigillata was lost and only in the middle of this century was the true nature of this...