Upper layer fermentation or lower layer fermentation? The difference between the two is the type of yeast used. This is also the standard for distinguishing between the two beer camps of ale and lager.  Upper fermentation Using traditional brewer’s yeast, the brewed beer has a special smell such as fruit or spices. The wine is thicker and has an alcohol content of up to 12%. The optimal drinking temperature is 6-12 °C. The Anglo-Saxons called this beer the name ale, which is the ancient wo […]