Bubbles indicating glass residue can be observed in a beer's pour. Clinging bubbles suggest dirt from grease, dust, beer remnants, or detergent. Proper carbonation is essential, and its appearance reveals cleanliness. A beer professional can determine the condition of a glass without visible smudges by analyzing bubble activity.
Bubbles clinging to the inside of a glass where it meets the liquid part of the beer are usually a sign some residue, such as grease, dust, leftover beer or detergent, is present.
Beer is a carbonated beverage, and the presence of carbonation can indicate the cleanliness of the glass. How and where carbonation appears is crucial.
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