Orange Bitters: Orange bitters is a form of bitters, a cocktail flavoring made from such ingredients as the peels of Seville oranges, cardamom, caraway seed, coriander, anise, and burnt sugar in an alcohol base. Orange bitters, which are not to be confused with the standard Angostura aromatic bitters, are currently enjoying a resurgence among cocktail enthusiasts. It is to be noted that the well-known House of Angostura is one of the producers of orange bitters.
Angostura Bitters: Angostura bitters is a concentrated bitters (herbal alcoholic preparation) based on gentian, herbs, and spices, by House of Angostura in Trinidad and Tobago. It is typically used for flavouring beverages or, less often, food. The bitters were first produced in the town of Angostura (now Ciudad Bolívar, Venezuela), hence the name, but do not contain angostura bark. The bottle is recognisable by its distinctive oversized label. Angostura is Spanish for 'narrowing', the town of Angostura having been at the first narrowing of the Orinoco River.