Blue Curaçao

From Freepedia

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

It has an orange flavour, with varying degrees of bitterness, but is used primarily as a colouring agent in cocktails and other mixed drinks. The famous blue colour is artificially added; curaçao liqueur is produced clear, and can have red, orange, green (or blue) colouring added.