Mash Bill

A mash bill refers to the specific mix of grains used in whisky production. In bourbon, the mash bill must contain at least 51% corn under US law, but other ingredients like rye, wheat, and barley also play an important role.

The choice of grains in the mash bill directly influences the whisky's flavor. For example, corn lends a sweeter character, while rye adds spicy notes.

Scotch whisky often uses only malted barley, resulting in a different flavor profile than American whiskey.