anthocyanin give the rind, flesh, and juice of the fruit their characteristic dark red color. Blood oranges were first discovered and cultivated in Sicily in the fifteenth century. Since then they have spread worldwide, but are grown especially in Spain and Italy under the names of sanguina and sanguinella, respectively. The blood orange, with its distinct color and flavor, is generally considered favorably as a juice, and has found a niche as an ingredient variation in traditional Seville marmalade. Maltese: a small and highly colored variety, generally thought to have originated in Italy as a mutation and cultivated there for centuries. It also is grown extensively in southern Spain and Malta. It is used in sorbets and other desserts due to its rich burgundy color. Moro, originally from Sicily, it is common throughout Italy. This medium-sized fruit has a relatively long harvest, which lasts from December to April. Sanguinelli, a mutant of the Doble Fina, was discovered in 1929 in Almenara, in the Castellón province of Spain. It is cultivated in Sicily. Tarocco is relatively new variety developed in Italy. It begins to ripen in late January. Acidless Acidless oranges are an early-season fruit with very low levels of acid. They also are called "sweet" oranges in the United States, with similar names in other countries: douce in France, sucrena in Spain, dolce or maltese in Italy, meski in North Africa and the Near East (where they are especially popular), şeker portakal ("sugar orange") in Turkey, succari in Egypt, and lima in Brazil. The lack of acid, which protects orange juice against spoilage in other groups, renders them generally unfit for processing as juice, so they are primarily eaten. They remain profitable in areas of local consumption, but rapid spoilage renders them unsuitable for export to major population centres of Europe, Asia, or the United States. Hybrid Sweet oranges have also given rise to a range of hybrids, notably the grapefruit, which arose from a sweet orange x pomelo backcross. A spontaneous backcross of the grapefruit and sweet orange then resulted in the orangelo. Spontaneous and engineered backcrosses between the sweet orange and mandarin oranges or tangerines has produced a group collectively known as tangors, which includes the clementine and Murcott. More complex crosses have also been produced. The so-called Ambersweet orange is actually a complex sweet orange x (Orlando tangelo x clementine) hybrid, legally designated a sweet orange in