The main substances in the aroma components of hops are oxygen-containing compounds such as acids, alcohols, ketones and carbohydrates: oxalene, aromaene, etc. These components are easily oxidized, polymerized and lose their due function, which changes the original taste performance.

What is the role of foam in craft beer: Craft beer foam is a polymer of bubbles separated from each other by a thin liquid film, and each bubble is surrounded by a film of beer substance. When you take a sip of beer, the foam should leave traces on the wall of the glass after the foam drops.