What does the term "mash bill" refer to in distilling?

The term "mash bill" specifically refers to the blend of grains utilized in the production of a spirit. In the context of distillation, the mash bill outlines the specific proportions of different grains, such as corn, rye, barley, and wheat, that are combined to create the mash. This blend is crucial as it influences the flavor profile, aroma, and character of the final distilled product. Each grain contributes unique qualities to the mash, which then undergoes fermentation and distillation to produce the spirit.

Understanding the mash bill is fundamental for any distiller since it determines not only the taste but also the style of the whiskey or spirit being produced. For example, a bourbon's mash bill must contain at least 51% corn to legally be classified as bourbon. Therefore, discerning the components of the mash bill can provide insights into the spirit's characteristics and regulatory classifications in the distilling industry.