Why a Good Espresso Shows Visible Crema (Tiger Spot)

When you order an espresso, you expect more than just a small black shot — you want something rich, aromatic, and visually telling. One of the first things skilled coffee drinkers look for is not colour or volume, but the presence of a distinct, golden-brown foam on top: crema. Also nicknamed 'tiger spot' in Chinese coffee discussions, it’s a key visual cue that your espresso might actually be well-brewed.

The short answer? A high-quality espresso typically shows a visible layer of crema — that amber, bubbly foam sitting on top. This crema, also called coffee lipids or creme, is a mix of plant oils, proteins, and sugars. Its presence signals proper extraction and higher dissolved solids concentration compared to regular drip coffee.

What Is Crema (The ‘Tiger Spot’) on Espresso?

Crema — often referred to as 'tiger spot' in Chinese coffee slang — is the light brown to deep amber foam that floats on the surface of a properly extracted espresso. Technically, it’s not just foam but a complex emulsion and colloid mixture. This layer consists mainly of plant-based oils, proteins extracted from coffee grounds, and soluble carbohydrates. What makes it stand out visually is its colour and texture: a rich, caramelised surface that contrasts with the dark liquid below.

Why Does Crema Form on Espresso — And Not Drip Coffee?

Crema exists because of the unique pressure and extraction process used in making espresso. When hot water (around 90–96°C) is forced through finely ground coffee under 9 bars of pressure, it extracts not just flavours but also tiny CO₂ bubbles trapped in roasted coffee beans. These gases, along with emulsified oils and fine particles, rise to the surface and form a stable foam layer. Because espresso is a concentrated brew — extracting more solids per unit volume than filter coffee — the crema also carries a higher concentration of dissolved compounds, giving it that signature viscosity and colour.

What Determines Good Crema? Key Factors in Crema Formation

Not all crema is equal. The quality, colour, and persistence of the foam depend on several technical factors during brewing:

• Grind Size: Too coarse, and water flows too fast, reducing pressure and crema. Too fine, and you may over-extract or clog the puck without improving crema quality.
• Brew Pressure: Espresso relies on around 9 bars of pressure to create the emulsion. Lower pressure yields little to no crema.
• Extraction Time: A typical espresso shot pulls in 25–30 seconds. Too short, and extraction is incomplete; too long, and crema can degrade.
• Freshness of Coffee: Freshly roasted beans (ideally within 7–21 days) contain more CO₂, which contributes to crema formation.
• Roast Level: Medium to medium-dark roasts tend to produce more visible crema due to their balance of oils and gases.

Does Crema Mean Better Espresso? What Really Counts

While crema is a strong visual indicator of a well-executed espresso, it’s not the sole measure of quality. A beautiful, thick crema can still cover up under-extracted or bitter flavours. Conversely, some single-origin espressos or lightly roasted beans may produce less crema but still taste excellent. That said, the absence of any crema often points to issues like incorrect grind size, poor puck preparation, wrong pressure, or stale coffee. In short, crema is a helpful signal — not a guarantee.

Frequently Asked Questions

What is 'tiger spot' in an espresso?

'Tiger spot' is a colloquial Chinese term for the visible crema — the golden-brown foam layer on top of a well-brewed espresso. It refers to the speckled, marbled appearance of good crema, which resembles tiger stripes. This layer is technically a mix of emulsified coffee oils, proteins, and microbubbles formed during extraction.

Why does my espresso lack crema?

Lack of crema usually results from one or more issues: incorrect grind size (too coarse or too fine), insufficient brewing pressure (not 9 bars), stale coffee beans, over-extracted or under-extracted shots, or poor puck preparation. Freshly roasted beans and proper technique help produce visible crema.

Is crema necessary for good espresso?

Crema is not absolutely necessary for good espresso, but it is a strong visual indicator of proper extraction. A great-tasting espresso can sometimes have light or minimal crema, especially if using certain single-origin beans or lighter roasts. However, no crema often signals a technical problem in the brew process.

How is crema different from regular foam?

Crema is not just foam — it’s a stable emulsion and colloid made of coffee oils, proteins, and dissolved solids. Unlike the fleeting foam on drip coffee or tea, crema forms under high pressure and includes microbubbles and lipids that give it a thicker, richer texture and longer persistence.

What colour should good espresso crema be?

Good crema typically ranges from light amber to deep reddish-brown. A balanced, well-extracted espresso often shows a golden-brown hue with a slightly speckled or 'tiger-striped' appearance. Very light or very dark/black crema can indicate under- or over-extraction.

Does crema affect espresso flavour?

Crema itself doesn’t define flavour, but it often correlates with proper extraction. A well-formed crema suggests that the espresso has extracted enough soluble material, which can contribute to body and aroma. However, flavour balance depends more on grind size, dose, yield, and roast profile.

Recommended FrontStreet Espresso Beans for Crema

For espresso with pronounced crema, try FrontStreet Coffee’s Classic Blend — a balanced mix delivering a rich, creamy crema with notes of dark chocolate and caramel. Their Black Cocoa Blend also produces a thick, velvety layer with deep cocoa and roasted almond tones, ideal for those who prefer a bolder crema. Both blends are designed for optimal pressure extraction and fresh roasting, ensuring a stable, glossy surface. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.