Baileys was the first liqueur to use cream and alcohol together in a manner sufficiently stable to allow commercial distribution. The cream and whiskey are homogenized to form an emulsion, with the aid of an emulsifier containing refined vegetable oil. This process prevents separation of the whiskey and cream during storage. The quantity of other ingredients used is not known but they include chocolate, vanilla, caramel and sugar. According to the manufacturer no preservatives are required, the whiskey alone is used to preserve the cream.