What types of alcohol are 90 proof?

"90 proof" refers to the alcohol content of a beverage. It translates to 45% alcohol by volume (ABV). Here are some types of alcohol that are typically 90 proof:

* Whiskey: Many bourbons, ryes, and blended whiskeys are 90 proof.

* Scotch: Some single malt Scotches can be 90 proof, though many are higher.

* Vodka: While some vodkas are bottled at 80 proof (40% ABV), some higher-end vodkas can be 90 proof.

* Rum: Some rums are 90 proof, particularly darker rums.

* Gin: Some gins, especially those marketed as "Navy Strength" gins, are 90 proof.

Note: Proof is a measure of the alcohol content, so any type of alcohol can be 90 proof. However, certain types of alcohol are more commonly bottled at this strength.