An evening at the bar should be about relaxation and fun with friends, not about watching air bubbles in the glass. However, according to beer experts, these bubbles could be the sign that the glass from which you drink is not so clean – and, even if it is not a major health danger, it can ruin your experience.
A clean glass will allow the beer to make a consistent foam. Photo: Istock
“The bubbles that stick to the inside of the glass, where the beer touches the glass, usually indicate the presence of residues – either fat, dust, detergents or traces of dry beer”, Explains Sara Hobday, beer expert and coordinators at Wine and Spirits Education Trust, according to Huff Post.
A perfectly clean glass will allow the beer to make a consistent foam, which persists and leaves traces of foam on the walls of the glass as you drink. This phenomenon, called “Lacing”, It is a clear sign that the glass is impeccable.
Foam, more than decor
Jessie Smith, an expert certified in beer and consulting in quality control, stresses that a correct beer served must keep a generous foam until the last drop. This not only improves the texture and taste of beer, but also protects the aroma, preventing oxidation.
Instead, the lack of foam, its quick disappearance or the absence of lake traces can signal a problem. If you feel an easy smell of “Wet dog” Or notice visible traces – such as lipstick on the edge of the glass – it is clear that something is not right.
How dangerous is a dirty glass truly
Fortunately, sanitary risks are minimal. Beer has an alcohol content, a low pH and compounds such as hops that inhibit the development of bacteria. However, if the glasses are not properly rinsed or if the distribution system is not properly cleaned, contaminations with wild yeasts may occur or traces of cleaning solutions – which can cause unpleasant taste or, in rare cases, burns or mild digestive disorders.
So, next time you order a beer, look at bubbles and foam carefully. It may not be necessary to send the drink back for a few wandering bulletings, but if the glass seems really suspicious, you have every reason to ask if a freshly washed one is needed.
