The Crema
What Is Crema?
Crema is the golden-brown foam that sits atop a freshly pulled espresso shot. It forms when pressurized hot water emulsifies coffee oils and suspends CO2 gas released from freshly roasted beans. This microfoam is unique to espresso — no other brewing method produces it.
How Crema Forms
Three elements combine to create crema:
- CO2 — freshly roasted coffee contains trapped carbon dioxide that is released under pressure
- Oils — coffee oils are emulsified by high-pressure water, creating a stable foam
- Proteins — melanoidins (Maillard reaction byproducts) stabilize the foam structure
What Good Crema Looks Like
- Color: golden-brown to hazelnut (not too pale, not too dark)
- Thickness: 2-3mm
- Texture: fine, uniform micro-bubbles
- Persistence: should last 2-3 minutes before dissipating
- Tiger striping: dark streaks in light crema indicate a well-extracted shot
Crema Myths vs. Reality
Myth: Thick crema means great espresso
Not necessarily. Robusta beans and very fresh roasts produce abundant crema regardless of cup quality. Crema itself tastes quite bitter — some champion baristas skim it off.
Myth: No crema means bad espresso
Old beans, lighter roasts, and certain origins produce less crema — but can still taste exceptional. Taste matters more than appearance.
What Affects Crema
- Freshness — beans 7-14 days post-roast produce the best crema
- Roast level — darker roasts typically produce more crema
- Pressure — standard 9 bar is optimal
- Species — Robusta generates nearly twice the crema of Arabica
At Röstschmiede, we view crema as one indicator among many. A beautiful crema is satisfying, but we always encourage our customers to judge espresso by taste first.
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