There’s nothing like the look of a creamy head on a homebrewed stout or the lacing on a glass after finishing a Belgian ale. But beer foam isn’t just about appearance. The bubbles from your beer impact carbonation level, aroma, flavor and body.
Beer foam is a complicated and far from understood phenomenon. So, what is foam? In short, foam is a dispersion of a relatively large amount of gas in a relatively small amount of liquid. It doesn’t happen spontaneously—it requires some energy by either agitating the beer (e.g. shaking or stirring) or creating a nucleation site (e.g. scratch on a glass or an engineered device) that allows bubbles to form and rise in the beer, sometimes referred to as “beading.”
So, how can homebrewers improve their beer foam?
Visit the American Homebrewers Association for the full article with tips and tricks to improve the head retention of your homebrew!