1) Ancient Roman pottery 
Barbotine is the French for ceramic slip, or a mixture of clay and water used for moulding or decorating pottery. In English the term is used for two different techniques. In the first, common from the Ancient World onwards, the barbotine is piped onto the object rather as cakes are decorated with icing, using a quill, horn, or other kind of nozzl...
• (n.) A paste of clay used in decorating coarse pottery in relief.
Bar'bo·tine noun [ French] A paste of clay used in decorating coarse pottery in relief.