Sienna (from Italian: terra di Siena, Siena ground) is an earth pigment containing iron oxide and manganese oxide. In its natural state, it is yellow-brown and is called raw sienna. When heated, it becomes a reddish brown and is called burnt sienna.long with ochre and umber, it was one of the first pigments to be used by humans, and is found in many cave paintings. Since the Renaissance, it has been one of the brown pigments most widely used by artists. The first recorded use of sienna as a colour name in English was in 1760.
Yokan is a Japanese sweet made from agar, sugar, arrowroot powder, water, and adzuki bean paste. It ends up something like Turkish Delight. Sometimes additional flavourings such as fruit or chestnuts are added. Westerners tend to prefer these, finding that for them the plain ones have no taste.
In other variations of yokan, the red beans are substituted with a white kidney bean paste which is known as shiro-an. Yokan is typically molded into a long rectangular block which is then sliced prior to serving. Mizu Yokan is a type of yokan which has a higher water content than traditional yokan. It is often chilled and served during the hotter summer months and is quite a refreshing dessert. There are several flavor varieties of yokan and mizu yokan.