Which of the following is a sign of a "beer clean" glass?

A "beer clean" glass is essential for serving beer at its best, and the characteristic of water sheeting and running off the glass rather than forming drips is a key indicator of this cleanliness. When a glass is "beer clean," it has been properly washed and rinsed, ensuring that any residual oils, detergents, or contaminants have been removed. This allows for proper adherence of the beer's carbonation and head when it is poured.

The water sheeting effect indicates that the glass is free from oils or residues that would otherwise cause water to bead up into droplets. This consistency in the glass creates a surface that allows for better retention of the beer’s head and overall presentation. When a glass is clean, it can enhance the drinking experience by allowing the beer's aromas and flavors to be more readily appreciated.

In contrast, the presence of large bubbles clinging to the sides suggests poor cleanliness, as this can indicate the presence of contaminants or oils that prevent proper drainage and affect the beer's appearance. A lingering foam head that does not dissipate could be due to various factors, including the style of beer or the carbonation level, but is not a definitive sign of glass cleanliness alone. Lastly, a frosted appearance often indicates that the glass has