Stirring a white sauce in an aluminum pot with a hard utensil will cause the sauce to turn what color?

When a white sauce is stirred in an aluminum pot with a hard utensil, the reaction between the aluminum and the sauce can lead to a grayish color. This occurs because the aluminum can react with the starches present in the white sauce, especially during the cooking process. The friction caused by using a hard utensil can also abrade the surface of the pot, leading to aluminum particles mixing in with the sauce, which further contributes to the discoloration.

The specific characteristics of the sauce, along with the cooking method and the equipment used, can significantly influence the final color. In this scenario, the grayish hue is a result of the interaction that occurs in the aluminum pot, which is not the case when using other materials that do not interact with the ingredients.