There is a glazing technique that gives rise to complex dendritic patterns on pottery. Sometimes called Mocha diffusion, the resulting pieces are called Mochaware. The name Mocha comes from the Red sea port of Mocha, now in Yemen, a city associated in England with the export of dendritic, or moss agates (Mocha stone). The technique dates from the 1780s, and was invented in Staffordshire in the UK. The earliest written reference to it comes from the Lakin & Poole factory in Staffordshire, and mentions "mocoe beakers" in 1792-1796. A dated mug from 1799 is in the Christchurch Mansion Museum, Ipswich, England. The term "mochaware" has unfortunately expanded to include many types of slip decoration which do not involve the dendritic patterns at all.