What Is Crema in Coffee and What Sets Its Thickness

What Is Crema in Coffee Made Of?

Crema is a foam layer supported by carbon dioxide, not a sign of better flavor. The main factor deciding how thick it looks is the carbon dioxide content left in the beans, followed by the insoluble oils in coffee. Beans holding more gas, extracted well, give a richer crema on espresso.

Because carbon dioxide itself does not determine taste, a thicker layer does not mean a better cup. Aroma and body come from aromatic compounds in the oils wrapped around the gas bubbles, plus fine particles mixed into the foam. Choosing beans with enough retained gas is the practical route to rich crema.

Many coffee enthusiasts pay special attention to the richness of crema when extracting espresso—some for latte art effects, and others influenced by merchant marketing. But is thicker crema really better? In fact, crema is just a foam layer supported by carbon dioxide, and it doesn't directly determine coffee flavor. The core factor that truly affects crema thickness is the carbon dioxide content in the coffee beans. This article will analyze the essence of crema, the relationship between crema and taste, and how to achieve ideal rich crema through bean selection and extraction from Front Street's perspective.

Setting aside coffee flavor, the thickness of the crema layer on the surface of espresso is an indicator that many friends particularly care about during extraction. Some need it for latte art, while others may be influenced by marketing concepts from bean merchants. From time to time, customers ask Front Street how to extract thicker crema. Therefore, today Front Street will carefully discuss how to extract rich espresso crema.

But before we begin, we need to clarify one point: espresso crema is not better simply because it is thicker. Although crema has "cream" in its name, it is actually a foam structure supported by carbon dioxide (Crema). Carbon dioxide itself cannot directly determine the quality of a cup of coffee's taste. When we often say that crema can bring more aroma and enhance body, what truly plays a role are the aromatic substances contained in the insoluble oils wrapped around the carbon dioxide, as well as the fine particles mixed into the crema.

What determines the thickness of crema is mainly the carbon dioxide content of the beans used for extraction (followed by insoluble oils). When the beans contain more carbon dioxide, under suitable extraction conditions, the espresso will present richer crema. Therefore, the thickness of crema cannot directly affect the taste. In other words, as long as you choose coffee beans with sufficient carbon dioxide content to make espresso, you can obtain rich crema.

What determines the thickness of espresso crema? The essence of Crema and the key factors for extracting rich crema