Barbotine n. : A paste of clay used in decorating coarse pottery in relief.

Example:


Taxonomy
barbotine, pottery, free encyclopedia, English, ancient world, vessel, 07-23, The slip, American art pottery, search, the French, mixture, clay and water, moulding, onwards, cakes, icing, horn.

Defination from the web:
barbotine is piped onto the object rather as cakes are decorated with icing, using a ... The first barbotine technique in pottery styling was in use in the ancient world. ...