Tile Mural, Thermae Christina, 117AD.

This Bathroom decoration was painted on 35 white glazed terracotta tiles 200 mm. square.
The paints used were firing enamels and gold and platinum.
The tiles were fired 4 times, a risky business but all the tiles survived and the completed picture, measuring 1400 x 1000 is fixed on the bathroom wall. Permanent art although the gold, being 24 carat, is a soft metal that shouldn't be cleaned with abrasives if possible.