Black Opal by Alexis N. CrockettMay 4, 2010February 16, 2012 Share0 Ingredients: Glass: 90ml Cocktail Glass Mixers: I Sml Opal Nera 15ml Baileys IrISh Cream 15ml Cointreau 15ml cream Method: Layer Opal Nera, Baileys, Cointreau and cream.