What Affects Coffee Clarity: Reasons for Color Variations in Pour-Over Coffee

What Can Coffee Grounds Tell Us After Brewing?

After brewing coffee, we can gather some information from the extracted coffee grounds to determine if there are any issues with the coffee in our hands. Some friends also observe the color of the coffee liquid—can we also detect some "clues" from this?

Why Is Brewed Coffee Too Dark?

When using transparent glass pots to hold brewed coffee, we can find that the liquid typically appears red, black, or a tea-like color somewhere in between. Visually, the darker the liquid appears, the stronger the coffee taste seems.

This is indeed one reason—the higher the coffee extraction rate, the more soluble substances are released, and naturally, the concentration of the coffee liquid becomes higher. Another factor is the roast level. Through observation, it's not difficult to find that dark roast coffee beans are much darker in color than light roasts, and the brewed coffee liquid follows the same pattern.

Does Dark Coffee Color Indicate Cloudiness?

To verify this point, FrontStreet Coffee used the same equipment, brewing method, and corresponding parameters to extract and compare two coffee beans with significantly different roast levels (PWN Golden Mandheling and Geisha Green Label).

Under the same intensity of light, both pots of coffee liquid were very clear without impurities. When tasted, the flavors of both beans were clear with high cleanliness.

Visual preconception can easily lead us to "imagine" the strength or weakness of coffee flavor based solely on liquid color. The lighter the coffee liquid color, the better its light transmittance, making us mistakenly believe that light roast coffee is clearer, leading us to give a "clean" evaluation when tasting coffee, while dark roast coffee appears "dark and turbid."

Compared to judging coffee concentration by its color first, FrontStreet Coffee suggests trying the actual thing—identifying the cleanliness of brewed coffee through tasting.

What Is High Coffee Cleanliness?

High coffee cleanliness means clear, bright, and transparent flavors, without any defective tastes such as earthy flavors, moldy tastes, or over-fermented sensations like rotten fruit.

How to Improve Coffee Cleanliness?

1. Purchase High-Quality Coffee Beans

First, higher quality coffee beans more easily present a pleasing cleanliness. The defect rate has been minimized during the production process, naturally reducing many negative flavors when it comes to the brewing stage.

2. Let the Beans Rest Before Brewing

Freshly roasted coffee beans are still in a degassing state. If brewed hastily at this time, the coffee taste can easily carry a dry sensation, and the flavors haven't "matured" properly, resulting in lower cleanliness. When you get a bag of fresh coffee beans, it's better to let them rest for 4-7 days until the coffee enters its optimal tasting period before brewing.

3. Control Brewing Parameters

Incorrect grind size creating too many fine particles, water temperature that's too high, or excessive steeping time can all more easily extract large molecular bitter substances from coffee, greatly reducing the coffee's cleanliness. Negative flavors in a cup of coffee are related to every parameter—properly controlling each brewing parameter can better avoid brewing problems.

4. Pour Water Steadily in Circular Motions

Unstable and overly rapid water flow injection into the coffee grounds layer "forcefully" stirring can easily lead to over-extraction or uneven extraction, thereby producing bitter tastes. Provided that the brewing parameters are not problematic, slow and gentle circular water pouring can also release the aromatic substances from coffee—it's not necessary to increase stirring intensity.

Finally, learning pour-over coffee is a gradual process. If your water flow is unstable, the only solution is more practice.

For professional coffee knowledge exchange and more coffee bean information, please follow Coffee Workshop (WeChat public account: cafe_style).

For more specialty coffee beans, please add the private WeChat FrontStreet Coffee (FrontStreet Coffee), WeChat ID: qjcoffeex