Blue Curaçao is a deep blue liqueur flavoured with the dried peels of bitter oranges grown on the island of Curaçao.

It has an orange flavor, with varying degrees of bitterness, but is used primarily as a coloring agent in In scuba diving, the word cocktail also means a hazard with diving with some rebreathers: it means a caustic solution resulting from water reaching and dissolving the absorbent. ... cocktails and other mixed drinks. Although blue is the most famous version, curaçao liqueur is also produced clear, or with orange or green coloring.