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Another good sign to look for is called lacing. This is when that tasty, tasty foam sticks to the side of the glass as it empties. A clean glass, Hobday said, “allows for residual foam to stick to the walls as you drink your beer, forming a lace-like pattern of parallel rings on the empty glass.”  A beer with no head, a head that fizzles out quickly or a beer that lacks visible lacing are all…