Same light roasted coffee beans but each tastes different!

Contents:
1.  How to define light roast?

2.  Using infrared rays to measure roast level.

Do you often buy coffee beans from many brands to taste, but even if the same beans and same roasting degree, they taste different? In fact, for the same light roasting degree from Justin Coffee may be a very light roast or a light medium roast from someone else's, so it will taste different.

The coffee roasting degree affects the flavor trend. Basically, light roast retains the existing flavor of coffee, and dark roast increases the caramelized flavor. If a coffee bean has multiple flavors, roasters will tend to retain more of the light roast flavor and add only a little caramelized flavor. How do we define light roast?

How to define light roast?

Basically, roasters will judge light or dark from the color of coffee beans, but everyone has different perceptions of color. For the same color, some people say it is light, some people say it is light medium, and some people say it is medium roast. In the Specialty Coffee Association (SCA), the Agtron value is used to define the degree of roasting, and there is an Agtron coffee roasting color chart to compare the color of coffee (as shown in the figure below). However, the roasting degree of the coffee bean surface and core is different, so the color after grinding will be different from before grinding. If the difference between the bean surface and core is large, the color difference before and after grinding will be large, and it is generally used after grinding for roasting degree color reference.

Using infrared rays to measure roast level.

For advanced tests, Agtron analyzers use infrared rays to measure. It measures the absorption of infrared rays by coffee powder and uses near-infrared rays of specific wavelengths to measure specific organic substances. The greater the amount of organic matter measured, the higher the value. Light roast has more organic matter obtained than dark roast, so the value is higher. Agtron values ​​range from 100 to 0, with higher values ​​representing lighter roasts, and vice versa for darker roasts. Generally speaking, the Agtron value of light roast is greater than 70, light and medium roast is between 60-70, medium roast is 50-60, medium and deep roast is 40-50, and below 40 are all kinds of dark roast.

The same roasted beans have different grinding size and different Agtron values. The finer the grinding, the larger the value; the coarser the grinding, the smaller the value. This is also because the finer the grinding, the larger the contact area of ​​the organic matter reacting with infrared rays. Therefore, Agtron also has a definition for the degree of grinding, which is defined as the percentage of the three meshes.

We like the multi-flavors of high-quality coffee and try to use light roast to retain more organic matters. At the same time, the same Agtron value will have different flavors due to the roasting method. The level of coffee produced can be affected by the roasting time, roasting temperature, gas flow pressure in the boiler, weight loss rate, roasting stage ratio, etc. Therefore, although the same “light roast” from different brands, it has the different flavor expressions due to the roaster's style, preference, and even professionalism. Good light roasted beans, full of flavors, balance of sweetness and acidity, smooth taste, good coffee deserves our careful taste.

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➤ CQI Q Grader coffee quality appraisers, personally cupping and evaluate, check every cup of coffee for you
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