What is the primary use of a pastry brush?

A pastry brush is primarily used to apply glazes or egg washes to pastries, breads, and other baked goods. This tool comes with soft bristles that are effective at spreading liquids evenly over surfaces, enhancing the appearance and flavor of the finished product. For instance, an egg wash can give baked items a beautiful golden color and a shiny finish, while a glaze can provide flavor and an attractive sheen.

The other options involve tasks that do not align with the primary function of a pastry brush. Mixing ingredients is typically done with a whisk or spatula, dusting flour onto surfaces usually requires a sieve or flour duster, and measuring ingredients is typically performed with measuring cups or spoons. Each of these tools has a specific design and function that is more suited to its respective task than a pastry brush.