In the case of the mai tai, which traditionally uses 1 ounce of white rum and ½ ounce of dark rum, you could use ½ ounce each of overproof white rum and 80-proof dark rum. For a "darker" dark and ...

One batch of rum takes about 300 liters of molasses ... That 164 proof is blended back in with New York City tap water to get to 80 proof, or 40% alcohol by volume. The finished product is ...