The recipe for making glass has changed little for several thousands of years: sand, alkali ashes, and lime from crushed stones are melted together to give a strong, yet fragile material. This molten material can then be manipulated by the glassmaker in a number of ways. This Bohemian covered goblet, dating from c 1742, has been decorated using a method called schwarzlot. This is a German phrase, which literally means 'black lead'. This style of decoration was principally used by German Haumaler, people who bought glassware to decorate at home. Early popular designs for this work included landscapes, battle scenes, and mythological subjects, but towards the beginning of the 18th century they included leaf and strap work, and chinoiseries, or Chinese style figures.