
Blue Curaçao is an orange-flavoured curaçao liqueur dyed vivid blue, its colour purely decorative over what is fundamentally an orange peel liqueur.
Orange peel-oil aroma leads, over a medium-sweet body with a low, variable bitterness; the flavour is that of an ordinary orange curaçao despite the colour.
Poured in small measures as an orange-flavour modifier and sweetener, it doubles as a colouring agent, tinting a build a vivid blue; interchangeable with other orange liqueurs on flavour alone.
Any orange curaçao or triple sec matches the orange aroma, sweetness and body; where the drink is chosen for its blue appearance, add a blue colourant to a colourless or orange curaçao, since no other common orange liqueur supplies that colour.
Triple sec / clear orange liqueur
Both are orange-peel liqueurs and interchangeable on flavour, but Blue Curaçao is dyed blue and curaçao styles run sweeter and lower-proof, while triple sec is a translucent, drier style.
Orange curaçao
The same base orange-peel liqueur, distinguished chiefly by added colour — blue rather than orange or amber; any flavour difference is a minor producer choice, not a category one.
Makers flavour it with the dried peels of the laraha, a bitter orange variety grown on Curaçao, whose aromatic peel oils carry the taste; the liqueur is naturally colourless, and the blue is added, usually with the synthetic dye Brilliant Blue FCF (E133 / Blue 1).
Curaçao liqueur takes its name from the bitter orange (laraha) of the Caribbean island of Curaçao, a former Dutch colony that supplied oranges to Dutch liqueur makers; the progenitor Seville orange was brought to the island by Spanish explorers in 1527.