A POT LID is a pottery cover for a shallow container of bear grease, pomade and cosmetics or fish & meat pastes. They were made between 1846 and 1880.
Jesse Austin, an engraver employed by Prattt, developed the process of transfer printing in polychrome to decorate the lids. His method consisted of using 5 or 6 copper plates. Each plate was for a different color and the color was transferred to tissue paper. Each color was transferred in sequence via tissue paper to the biscuit fired pottery, the outline color being the final application. Each color took about 2 days to dry and when all the necessary colors had been transferred the lid was glazed and fired.
A. Ball, "Price Guide to Pot-lids".
Cyril Williams-Wood, "Staffordshire Pot Lids and their Potters ".