Which test can determine if a glass is clean enough for beer serving?

The sheeting test is the correct method for determining if a glass is clean enough for serving beer. This test involves observing how water forms a sheet on the inside of a glass. When a glass is clean, water will form a continuous film that sheets evenly across the surface without breaking up. If the glass has residues or oils from previous contents, water will bead up in certain areas, indicating that the glass is not adequately clean.

This test is crucial in the beer-serving context because any leftover residue can impact the beer's foaming and overall presentation. Clean glassware is essential for preserving the beer's aroma and flavor, making the sheeting test a practical and visual method to ensure cleanliness before serving.

Other tests, while important in different contexts, do not specifically address cleanliness in the same way. For instance, the foam test examines the quality of the beer's foam rather than the cleanliness of the glass, while the color and odor tests are generally related to the beer itself, rather than the glassware used for serving.