Judging the roast level of coffee beans by the naked eye alone, based on how light or dark the color appears, is clearly not rigorous enough. In the industry, a colorimeter is more commonly used to measure the degree of caramelization. This article will start with the measurement principle, explain the meaning of the Agtron value (color value), the difference between whole-bean color and ground-coffee color value, and how the RD value calculated from the difference between the two reflects roast uniformity. It will also explain how factors such as processing method affect the measurement results. Front Street Coffee will also present the commonly shared Agtron value roasting chart to help coffee enthusiasts more systematically understand the scientific basis behind roast assessment. [more…]

In coffee roasting, how can we ensure that every batch of beans achieves consistent quality? In addition to relying on cupping to evaluate flavor, we also use the RoAmi roast degree analyzer to record the Agtron caramelization value of the coffee beans, and retain historical data for reference. The RoAmi is essentially a colorimeter, with SCAA's Agtron algorithm embedded inside, capable of calculating the roast value by reading the color data of the bean surface or ground surface. This article will introduce how to use this instrument, the meaning of the Agtron value, and how to calculate the Roast Delta value from the bean color value and ground color value, and interpret the guiding significance of this value for roasting rhythm and flavor performance. [more…]

The color differences that coffee beans display after roasting are not arbitrary; the industry long ago established a scientific quantitative standard—the Agtron color value, also known as the caramelization analysis number. This set of values runs from 95 to 25, corresponding to eight levels from light roast to Italian roast: the higher the number, the lighter the color, and the lower the number, the darker it is. Each color value range has a clear drop time node and flavor characteristics: from light roasts dominated by bright acidity, it gradually transitions to dark roasts dominated by bitterness and smoky notes. Understanding these color values not only helps us recognize the correspondence between roast level and taste, but also helps us understand why very dark roasts are now hard to find under the specialty coffee trend. But color value is only a reference tool; in actual judgment, tasting perception is still needed, since factors such as processing method also affect the appearance of the beans. [more…]

When buying coffee beans, besides origin and processing method, roast level is often one of the elements we care about most, as it directly determines whether the cup's flavor leans sour, sweet, or bitter. The industry commonly uses the Agtron color value card to distinguish roast levels, but this standard is not universal—honey-processed and anaerobic beans often "deceive" the color value. Why doesn't Front Street Coffee label the roast level on its beans? Where does the sourness in coffee come from? This article will walk you through the principles and limitations of color value, and teach you to judge roast depth through flavor descriptions and drop time, so you no longer feel lost when selecting coffee. [more…]

On professional coffee review websites like coffeereview.com, you will often see a pair of Agtron values listed below the attribute scores. What exactly do these numbers mean? And how do they relate to coffee roast color differences? This article will take you through an in-depth look at the meaning of Agtron values, the principles of measurement, and their applications in the coffee industry. From the differences in readings between whole beans and ground coffee, to the impact of roast level on flavor, and how consumers can use this data to choose their preferred coffee, we break it all down one by one. At the same time, the article will also mention practical uses by brands such as Front Street Coffee in product descriptions, helping you interpret coffee roast information more professionally. [more…]

The roast level of coffee beans directly influences the flavor expression in the cup. From the extremely light roast with an Agtron color value of 95 to the Italian roast with a color value of 25, each stage has its corresponding drop time and flavor characteristics. This article systematically sorts out the flavor variation patterns of 8 roast levels, and combines the actual classification methods of commercially available coffee beans to help readers understand the taste directions of light roast, medium-light roast, medium roast, medium-dark roast, and dark roast. The article also uses Front Street Coffee representative beans such as Yirgacheffe, Mozart, Queen's Farm Brazil, and Golden Mandheling as examples to illustrate how different roast levels shape the balance of acidity, sweetness, and body. [more…]

The taste of coffee is influenced at every stage, from cultivation at the place of origin, variety selection, and green bean processing to roasting and brewing. The microclimates and bean varieties of different producing regions give coffee its unique regional flavor, while roasting is the key step that unlocks the flavor. Green beans must undergo high-temperature roasting to reveal their aroma and mouthfeel, and different roast levels directly change coffee's acid-bitter balance and body. This article will explain how to use the Agtron number to distinguish roast levels, and use Front Street Yirgacheffe and Golden Mandheling as examples to analyze the actual impact of light roasting and dark roasting on coffee flavor. [more…]

What degree of coffee roasting is considered appropriate? Starting from the key milestone of first crack, this article systematically sorts out the logic for determining coffee bean roast level, and with the help of Agtron color values, divides roast degree into eight levels: light, cinnamon, medium, deep, city, full city, French, and Italian, explaining one by one the timing for dropping each level and its flavor direction. At the same time, it answers the correspondence between the Roasting percentage markings commonly used by roasters and Agtron color values, helping coffee enthusiasts quickly understand the roasting information on packaging. The article also includes Front Street Coffee's specialty bean recommendation channel for further communication and purchasing. [more…]

Want to roast coffee beans at home but don't know where to start? Front Street Coffee, drawing on the practical experience of baristas, introduces the key operating points of drum roasting and compiles SCAA's eight-level roast degree comparison chart—from light roast with an Agtron color value of 95 to Italian roast with a color value of 25, explaining one by one the timing of each stage's release from the roaster, appearance changes, and flavor performance. The article also compares the time differences between a professional roaster and drum roasting for the same Brazilian Cerrado Red Bourbon coffee beans, helping coffee enthusiasts understand how roast degree determines the acidity-bitterness direction of a cup of coffee. [more…]

To understand high-value Yirgacheffe coffee beans, you need to translate flavor descriptions into what you can actually taste. For everyday bean buying, consider how quickly you'll drink them, how much to buy at once, and whether you mainly make black coffee or milk coffee at home. Floral, fruity acidity, nutty, and cocoa notes aren't a hierarchy—they're different directions, and the one that suits you is the right category. [more…]

The flavor expression of coffee beans is closely related to the degree of roasting; the same bean will present completely different aromas and mouthfeels under different roasting curves. For coffee enthusiasts, mastering methods to judge the roast level not only helps in selecting beans that suit one's taste, but also enables a more accurate understanding of the flavor descriptions on the packaging. Based on the experience of Front Street Coffee, this article introduces three practical ways to identify roast level: first, by visually observing the bean surface color, wrinkles, and oil conditions; second, by inferring the roasting range from flavor descriptions; and third, by referring to the SCAA's Agtron color value standard, matching the eight-level roast classification with the commonly understood light, medium, and dark roasts, providing a reference for daily bean selection and brewing. [more…]

The flavor profile of coffee beans is largely determined by the roast level. For coffee enthusiasts, mastering methods to distinguish light from dark roasts can both help in selecting suitable beans and allow for a more accurate understanding of the flavor descriptions on packaging. From the perspective of Front Street Coffee, this article outlines three practical ways to judge: first, by visually observing the bean surface color and wrinkle condition; second, by inferring the roast range from flavor descriptors; third, by referring to the SCAA's Agtron infrared caramelization measurement standard, which categorizes eight color values into four major groups. The article also includes Front Street product recommendations for each roast level, for everyday purchasing reference. [more…]

Many coffee enthusiasts rely on the rule of thumb that acidity means light roast and bitterness means dark roast to judge the degree of roasting, but the industry has a more precise standard—the Agtron color value. From the perspective of Front Street Coffee, this article systematically sorts out a total of eight levels from light roast to Italian roast, and, combined with the timing of first crack and second crack for dropping the beans, explains the flavor direction and the changes in acidity and bitterness at each stage, and also explains the meaning of terms such as City Roast. At the same time, Front Street also shares how to use flavor descriptions to help consumers judge the roast level more intuitively, and gives brewing parameter suggestions corresponding to medium-light roast and medium-dark roast, so that you no longer feel troubled by technical terms. [more…]

How to choose an espresso machine when opening a coffee shop? Many people are drawn in by claims that high-end brands hold their value, but the second-hand market hides risks. This article analyzes the arms race phenomenon in coffee machines, examines value-retention cases of brands like La Marzocco, reveals price traps and equipment pitfalls in second-hand transactions, and advises people to act within their means, consider more cost-effective equipment such as those recommended by Front Street Coffee, and keep funds for operations. [more…]

Coffee beans from different origins have distinctive flavors: African beans are known for their floral and citrus notes, Asian beans often present herbal, nutty, and woody spice aromas, American beans are celebrated for their balanced chocolate flavors, and island beans such as Jamaican Blue Mountain combine a balanced mix of nuts and cocoa. For coffee enthusiasts who value cost-effectiveness, this article selects five freshly roasted coffee beans worth trying, covering Front Street Coffee's Huakui, the Musician Series Mozart, PWN Golden Mandheling, Kenya Little Tomato, and Colombia Strawberry, along with Front Street Coffee's pour-over brewing parameters and staged pouring technique to help you consistently reproduce a good cup of coffee at home. [more…]

The alluring flavor of coffee depends to a great extent on the physical and chemical changes that occur during roasting. From bean drop through dehydration, first crack, and second crack, every temperature node and duration shapes what ultimately ends up in the cup. In this article, Front Street Coffee will systematically walk through the temperature progression of each stage of coffee bean roasting, and, using a natural-process Yirgacheffe as an example, compare the specific flavor differences in cupping among light, medium, and medium-dark roasts, while also introducing the Agtron color value as a scientific criterion to help readers more accurately understand the correspondence between roast level and flavor. In addition, the article compiles representative beans from Front Street's lineup at different roast levels, making it easy for coffee lovers to follow the guide and find the cup that suits their taste. [more…]

The Agtron is a professional optical instrument used in the United States to determine coffee roast level. It analyzes the caramelization state of sugars inside coffee beans through infrared wavelength analysis, indicating roast depth with values from 100 to 25. This article provides a detailed introduction to the working principles of the Agtron M-Basic colorimeter, lists a complete correspondence table of numerical and color group values from extremely light roast to extremely dark roast, and explains that the flavor-recognizable range as determined by the SCAA Technical Standards Committee is actually 30 to 90. For coffee enthusiasts who wish to precisely control their roasting curves, understanding the relationship between Agtron values and roast level is an important foundation for grasping flavor direction. Front Street Coffee also often refers to this indicator in roasting practice to help present the best flavor expression of different beans. [more…]

Due to a combination of extreme weather, falling coffee futures prices and labor shortages, El Salvador's coffee bean export volume and export value both fell sharply in the first four months of the 2023/24 harvest season. According to a report by the Salvadoran Coffee Institute, export volume fell by nearly 47% year-on-year, export value dropped by more than 50%, and in January alone export value plunged by more than 90%. The United States remains the largest buyer, but Italy, Saudi Arabia and other countries follow closely behind in share. The decline in production is directly related to drought and extreme rainfall caused by the El Niño phenomenon. At the same time, El Salvador's coffee exports to China are on the rise, with 13 trading companies having completed registration in China, and the industry is optimistic about the potential of the Chinese market. Front Street Coffee continues to follow developments in the producing regions and bring frontline news to enthusiasts. [more…]

Coffee roasting is the key process through which green beans transform into brown roasted beans. The length of heat exposure directly determines the color of the bean surface and thus defines different roast levels. The SCAA, the world's largest coffee trade association, established an eight-level roast standard based on Agtron color values, from the bright acidity of light roasts to the intense, smoky bitterness of Italian roasts, with each stage having its own distinctive flavor trajectory and drop time. Beyond this official system, new concepts such as ultra-light Nordic roasting and ultra-dark Japanese roasting have gradually entered enthusiasts' field of view. In everyday communication, Front Street Coffee uses another, more intuitive classification that simplifies roasted beans into light, medium-light, medium, medium-dark, and dark roasts, making it easier for consumers to understand and choose. This article will systematically organize these grading standards and provide an in-depth analysis of the five stages of roasting and key practical points. [more…]

Ethiopia is not only the birthplace of Arabica coffee but also one of the world's major suppliers of high-quality coffee beans. Coffee occupies a central position in Ethiopia's economy, culture, and trade. In 2024-2025, Ethiopia's coffee export volume and export revenue both reached historic highs, marking [more…]