 From the 1790s there was also a large production of figures in unglazed biscuit porcelain, which resembled marble.Many of these were rather loose copies of famous ancient sculptures, especially those in the rich royal collections, including portrait busts; the factory was allowed to borrow these to copy.A wall-painting of Achilles being taught to play the lyre by the centaur Chiron, removed from a house in Herculaneum by the 1750s, was becoming famous, and was reproduced both on a painted cup and as a biscuit figure group by the factory (the was in fact a rendering of a sculpture in Rome).