Capers are one of the ingredients of tartar sauce. They sold a single-action baking powder containing cream of tartar, bicarbonate of soda and starch. It is also a base in sauces such as Tartar sauce. Baking soda and cream of tartar were sold by chemists rather than in grocery stores. The use of cream of tartar imparts a honey-like flavor to the syrup. Given time, plaque can mineralize along the gingiva, forming "tartar". Sodium polyphosphate is added to minimize the formation of tartar. It has an agreeable taste, like cream of tartar. By the 1970s Royal had ceased to produce a cream of tartar baking powder. In cooking it is known as cream of tartar. A whipping agent, such as cream of tartar, is commonly added. Bakewell Cream was introduced as a replacement for cream of tartar. This means that the only active ingredient is the cream of tartar. Ultramarine has also been found in dental tartar of medieval nuns and scribes. See the Muslim, Haroun Tazieff of princely Tartar extraction.