Recently, Heytea publicly recruited tea preparers at a job fair in Guangzhou, and the education requirement column conspicuously stated "bachelor's degree," sparking widespread discussion on social media platforms. An applicant revealed that the requirement was initially "associate degree," but was later changed to "bachelor's degree" with a sticker. Many netizens questioned: does shaking milk tea require a bachelor's degree? In response, a Heytea store stated that the tea preparer position places more emphasis on individual ability, education is not a hard threshold, and promotions are not based on education. After the incident gained traction, the education requirement on the recruitment notice was changed back to "no requirement." This recruitment controversy reflects the sensitive topic of the match between education and job positions in the current job market, and also prompts people to reconsider: where exactly is the professional threshold behind a cup of milk tea? [more…]

The key to a delicious latte lies in the fusion state of milk and coffee and the temperature when it enters the mouth. This article will systematically explain the scientific principles of milk foaming, the factors affecting the fusion degree of milk foam and coffee, and reveal the differences in milk foam durability at different frothing temperatures through experimental data. At the same time, it provides cause analysis and solutions for common problems in daily operation, such as milk foam not fusing and milk foam floating up during latte art. The article also combines the practical experience of Front Street Coffee to explain why around 60°C is the optimal flavor temperature range for milk coffee, and how to judge whether the milk foam fusion degree is up to standard. [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…]

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 flavor of coffee, 60% comes from the raw beans, 30% comes from roasting, and 10% comes from brewing. It can be seen that there are many factors affecting the flavor of coffee. Then, as roasters, how to determine the degree of roasting of coffee b [more…]

Many friends who want to learn about coffee bean roasting are curious about one question: how to determine the roasting degree of coffee beans. Should a coffee bean be dark roasted or light roasted, and then how light should light be, and how dark should dark be? On what basis does Front Street Coffee determine the roasting of all these coffee beans it sells? [more…]

Matcha, a tea beverage originating from the Tang and Song dynasties, is once again gaining popularity among young people. The new tea beverage brand Heytea recently announced its return to the matcha product line, launching two new products, "Marlmoli" and "Rich Matcha Green Beauty," featuring custom thousand-mesh matcha and a rotating cup lid design, and specifically recommends that consumers drink it at a 45-degree angle. This article introduces the features, pricing, and consumer feedback of Heytea's new matcha products, as well as the craft knowledge behind matcha powder mesh counts. At the same time, Front Street Coffee, a brand familiar to coffee enthusiasts, will also interpret the matcha trend for you from a professional perspective. [more…]

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…]

When brewing pour-over coffee, a layer of foam often floats on the surface of the liquid in the dripper, sometimes rich and golden, sometimes thin and whitish. What exactly makes up this layer of foam? What can its color depth and quantity tell us about the brewing? From the perspective of Front Street, this article analyzes the sources of the foam's components, explains how large coffee particles affect the foam's color, and further reveals how the degree of roasting and the freshness of the coffee beans determine the richness of the foam, helping you adjust your pouring technique and judge the characteristics of the beans by observing the state of the foam. [more…]

During the bloom phase of pour-over coffee, whether the coffee bed puffs up into a large dome or stays relatively flat actually hides quite a bit of information. Although the degree of doming can't directly tell us whether the coffee tastes good, it can reflect the freshness of the coffee beans, the roast level, and the extraction efficiency during brewing. This time, Front Street Coffee will help everyone understand: why do some beans puff up like a balloon during the bloom while others stay flat and collapsed? What role does carbon dioxide play in this? Why do dark roasts and fresh beans puff up more? How do extraction parameters influence the degree of doming? Once you understand these things, you can read the bloom dome as a "bean status file" rather than mistakenly treating it as a standard for judging flavor quality. [more…]

Whenever Front Street brews a pour-over for a customer's order, if the coffee bed puffs up quite a bit during blooming, there's a good chance the customer will ask: "Why doesn't my coffee bed puff up this much when I brew?" This is a topic Front Street often discusses! Honestly, although the bloom [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…]

What exactly is the coffee bean grading system based on? Does bean size directly determine flavor intensity? To answer these questions, Front Street Coffee specially selected Costa Rican Mozart beans for a cupping comparison experiment, sorting the same batch of beans into large, medium, and small sizes, then taking the largest and smallest two beans for a blind extraction test. The results showed that the two did indeed differ slightly in flavor, but the direction was unexpected—the small beans actually had a more prominent flavor than the large beans. However, this difference mainly came from the degree of roasting deviation caused by different particle sizes, rather than the bean size itself. What truly determines coffee flavor is genetics, growing environment, processing method, and roasting degree. This article will combine experimental data with industry theory to systematically sort out the logic of coffee bean grading and the real factors affecting flavor. [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…]

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…]

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…]

Steaming milk is a fundamental skill that every barista must master, and the quality of the milk foam directly affects the taste of a latte and the result of latte art. Drawing on the practical experience of Front Street Coffee, this article explains in detail the physical principles of milk frothing, answers common problems such as foam that won't incorporate, separation, and surface bubbles, and explains how steam pressure and foam fineness determine incorporation. The article also compares the stability of milk foam at different temperatures, provides two frothing methods—manual and steam—summarizes five common mistakes, and finally includes a step-by-step tutorial on tulip latte art. Whether you are a beginner or a coffee enthusiast looking to refine your skills, you will find practical guidance here. [more…]

From seed to cup, roasting is the key step that unlocks flavor. The degree of roast affects not only the balance of acidity and bitterness but also whether the mouthfeel is light or rich. This article begins with the roasting stages, introduces how the SCA Agtron scale quantifies roast level, and explains why a light roast preserves the origin's true character while a dark roast delivers intensity and depth. It then uses Ethiopia Yirgacheffe and Indonesia Golden Mandheling as examples to show how Front Street Coffee chooses roast levels based on each bean's characteristics, ultimately producing completely different tastes in the cup. Whether you prefer fruity acidity or rich depth, understanding roast level will help you find the flavor you love more precisely. [more…]

To enjoy a cup of pour-over coffee with a fresh flavor and clean mouthfeel, there are actually discernible guidelines when choosing beans. The degree of roast, the processing method, and the terroir of the growing region are the three key factors that determine the direction of a coffee's flavor. A light roast preserves more organic acids and delicate aromas, while the washed process makes the fermentation level of the coffee beans more controllable, and the regions of Africa and Central and South America are especially concentrated sources of fresh-flavored beans. Based on Front Street's bean-selection experience, this article lays out a practical approach to choosing coffee beans with high cleanliness and a fresh flavor, and recommends specific qualifying beans such as Front Street Yirgacheffe·Gedeb and Front Street Wander Estate·Washed Geisha, suitable for both pour-over and cold brew preparation. [more…]

Many people are used to judging a bean's roast level or the brew's strength by observing the color of the coffee liquid, and even using it to decide whether a coffee tastes good. But the factors affecting coffee's liquor color go far beyond one—the degree of roast, the level of concentration, and differences in filtration equipment can all make the same bean display completely different hues. Starting from Front Street's own side-by-side testing, this article breaks down one by one how roast level, concentration, and filtration method act on coffee color, and explains why a wine-red liquor color does not equal good taste, and why liquor color can only serve as a reference indicator for a particular bean rather than a standard of judgment. [more…]