Roast Level Discussion: Is Light Roast Coffee Easier to Store or Dark Roast Coffee? How to Brew Dark Roast Coffee Beans

Research Topic: Are Light-Roasted or Dark-Roasted Coffee Beans Easier to Store?

To answer this question, we need an experiment: when blooming, which type of bean, light-roasted or dark-roasted, releases gas for a longer period? By comparing the gas release of beans at different roast levels, we can judge how much gas a bean still needs to release during storage. From the principle that gas release equals flavor loss, we can reason that beans with vigorous gas release are more difficult to store.

Experiment Setup

Today we are using two beans for comparison:

First: Golden Mandheling Wet-Hulled Process G1, dropped before the second crack

Second: Yirgacheffe Kochere Washed Process G1, dropped 1 minute 45 seconds after the first crack

Both beans were roasted within the same hour on the 24th.

They were used for brewing 24 hours later, on the 25th.

Here, we set aside the brewing process and extraction efficiency and simply observe which one has the longer blooming time.

Experimental Groups

Divided into two groups:

Using a BARATZA BG grinder

Using a blooming water temperature of 90C

Using a blooming water amount of 35g, plus or minus 1g

First Group: Fine Grind Suitable for Pour-Over

Light-roasted Yirgacheffe Kochere

Medium-dark roasted Golden Mandheling

Second Group: Coarse Grind Suitable for Pour-Over

1. Light-roasted Yirgacheffe Kochere

2. Medium-dark roasted Golden Mandheling

Blooming is meant to let the coffee particles fully contact water, allow the fiber gaps to absorb enough water, and release gas, which benefits the subsequent extraction and flavor release.

Observations

From the timer above, we observed that

the light-roasted Yirgacheffe has a longer gas release time, as if desperately breathing continuously, unwilling to lose its life.

while the dark-roasted Mandheling has already stopped "breathing," its gaps fully expanded to achieve maximum gas release.

Because the fibers of light-roasted beans are relatively compact, with fewer and smaller gaps, they need more time to absorb water fully, and some denser areas of grounds will keep releasing gas for longer.

The gaps between the internal fibers of coffee beans become looser and more numerous with a deeper roast. This is because the beans expand and may also develop cracks, making them more brittle. As a result, blooming and gas release end earlier than for light-roasted beans.

Dark Roast Coffee Bean Brand Recommendations

FrontStreet Coffee roasts a range of dark roast coffees, including Honduras coffee, Brazilian Red Bourbon, and Indonesian Mandheling, all with guaranteed quality and brand reputation.

FrontStreet Coffee Recommendation

The experiment above used a light-roasted Yirgacheffe as its reference point, which makes FrontStreet Coffee's washed Ethiopian beans a natural match for anyone who wants to taste the bright, tea-like freshness that a lighter roast preserves. The FrontStreet Washed Yirgacheffe is known for white jasmine and vivid citrus-lemon acidity, and because its fibers stay dense, it rewards a careful bloom exactly as this article describes. The FrontStreet Gotiti Cooperative coffee is fully washed and shows white florals, orange, and green tea, while the FrontStreet Natural Red Cherry adds berry juiciness and honey sweetness through a natural process. If the medium-dark Mandheling side of the comparison appealed to you more, the FrontStreet Golden Mandheling delivers the low-acid, full-bodied cup that anchored the other half of the test.