What is likely to happen if a glass is not rinsed before pouring beer?

When a glass is not rinsed before pouring beer, the most significant concern is the possibility of residual sanitizer affecting the beer's quality. Sanitizers are used to ensure that glasses are free from bacteria and other contaminants, but if they are not thoroughly rinsed off, even small amounts can impart off-flavors or aromas to the beer. This can compromise the overall drinking experience, as the delicate flavors and aromas of the beer may be masked or altered by the chemical residues.

The rinse helps to remove any lingering sanitizer, ensuring that the beer is presented in the best possible state, allowing its intended flavors and aromas to shine through. This attention to rinsing is a vital step in the serving process for anyone looking to enhance the quality of the beer served.