Before green coffee beans reach our hands, they often go through many stages, during which defects are almost unavoidable. Some defects are obvious at the green bean stage, yet once roasted they may be cleverly concealed. The SCAA (Specialty Coffee Association of America) has established strict grading standards for specialty Arabica coffee, covering multiple dimensions such as defect types, moisture content, aroma, and bean size. This article will systematically sort out the SCAA's defect classification rules and scoring requirements, explain in detail the causes of various defective beans and their impact on cupping flavor, and help enthusiasts develop a keen eye for identifying specialty coffee. At the same time, the article retains relevant recommendations from the Front Street brand for readers' reference. [more…]

Defective beans are generally considered in the specialty coffee world to affect the flavor performance of a cup of coffee. If you have the habit of buying coffee beans and brewing at home, do you need to specifically pick out defective beans before brewing? In fact, green coffee beans undergo grading after processing, and most grading systems include a defect rate indicator. The number of defects in high-grade coffee beans has already been pressed to a very low level. From green bean grading, removal before roasting, to screening after roasting, with layer upon layer of checks, there is basically no need to worry about defective bean issues when buying roasted single-origin coffee beans. However, some coffee beans that look like defects are actually normal phenomena. Front Street Coffee has summarized several common types of situations that are easily misjudged, to help everyone distinguish them accurately. [more…]

Many coffee enthusiasts, when first encountering coffee beans, often misjudge defective beans based on unusual appearance. In reality, true defective beans are mainly concentrated at the green bean stage, and most have already been screened out at the producing region and roasting stages. Among the beans consumers buy day to day, those covered in wrinkles, with cracks, or on the lighter side in color are often not defects, but normal phenomena brought about by light roasting, high-altitude cultivation, or specific processing methods. This article systematically sorts out the classification standards for green coffee bean defects, distinguishes true defective beans from appearance traits that are easily misunderstood, and introduces Front Street Coffee's practice of double screening before and after roasting, helping readers build a more accurate basis for judging quality. [more…]

The SCAA Coffee Flavor Wheel is a core tool for specialty coffee enthusiasts to identify flavors, yet many people are still unfamiliar with it. This article systematically breaks down the left-right structure of the flavor wheel: the right side, the normal flavor spectrum, reveals the three major aroma sources of fermentation, sugar browning, and dry distillation, while the left side, the negative flavor spectrum, corresponds to the defective flavors produced by improper green bean processing, storage, and roasting. It also explains in detail the deduction rules for different defects in SCAA cupping—serious defects deduct 4 points, minor defects deduct 2 points—and how roasting and organic matter loss, although not deducting defect points, can lower flavor performance. The article includes the latest high-definition Chinese-English flavor wheel images and retains Front Street Coffee's communication channels, making it suitable for readers who want to gain a deeper understanding of coffee sensory evaluation. [more…]

The Huakui coffee from the Sidamo region has become a star among Ethiopian natural beans, thanks to its rich floral and fruity aromas and honeyed sweetness. This article begins with Ethiopia's coffee grading standards, sorting through the two systems of cupping scores and green bean defect rates, and explaining the differences between G1 and G3 grades as well as the impact of ECX reform on the grading of natural beans. It then focuses on Hambela in the Guji region, introducing Huakui's origin terroir, farm background, traditional natural processing, and the origin of its name from winning TOH. Finally, it includes Front Street Coffee's light roasting approach for Huakui and V60 three-stage brewing parameters, helping readers fully understand the flavor sources and extraction key points of this bean. [more…]

Ethiopia is a globally important coffee-producing country, and its grading system is based on two core criteria: cupping performance and the defect rate of green beans. Huakui coffee beans originated in Hambela, in the Guji zone of Sidama, and rose to fame by winning the 2017 TOH competition, becoming a star product among natural-process beans. This article provides a systematic overview for coffee enthusiasts, covering Ethiopian grading standards, the background of the Hambela production area, the origin of the name Huakui, the natural processing method, and the brewing parameters and flavor performance of Front Street Coffee's Huakui coffee. Whether you want to understand the real difference between G1 and G2, or want to master the specific technique of V60 three-pour extraction, you will find clear answers in this article. [more…]

As an agricultural product, coffee beans vary significantly in quality, so a grading system is needed to standardize quality and provide reference for buyers. However, the geographical environments and cultivation models of global producing regions differ enormously, making it impossible to measure them with a unified standard; each region can only adapt to local conditions. Currently, mainstream grading methods fall into three major categories: screen size, altitude/hardness, and defect rate, and many countries combine them or even add cupping to compensate for shortcomings. This article will systematically sort out the logic and representative producing countries of these three grading methods, with a focus on analyzing how Kenya grades solely by bean size, and introduce the grading practices of Colombia, Ethiopia, Jamaica, Indonesia, Brazil, and other countries. Front Street Coffee will also share related brand product information to help coffee enthusiasts understand the meaning behind green bean grades. [more…]

Golden Mandheling is one of Asia's most iconic single-origin coffees, but with so many imitations on the market, how can consumers tell the real thing from the fake? This article starts with the three unique features of Front Street PWN Golden Mandheling, explaining in detail PWN's strict purchasing and screening process, how to identify the registered trademark, and Indonesia's grading standards for Mandheling based on the number of defect beans. It also introduces the product information and flavor characteristics of two Indonesian Mandheling offerings at Front Street, helping coffee lovers master the essentials of identifying Golden Mandheling, from bean size to cupping flavor. [more…]

Mandheling coffee is deeply favored by enthusiasts for its rich and full-bodied taste, but do you know the grading standards for Indonesian coffee beans? What exactly are the differences between PWN Golden Mandheling and regular G1 Mandheling? This article will provide a detailed introduction to the grading system for Indonesian green coffee beans, analyzing the grade standards from G1 to G6 based on defect rates, screen sizes, and other dimensions, and will delve into how PWN company creates its uniquely distinctive Golden Mandheling through strict screening processes. At the same time, Front Street Coffee will share brewing suggestions for Golden Mandheling to help you better savor this high-quality coffee with regional character. [more…]

Coffee enthusiasts often ask in the shop exactly what the difference is between Ethiopia's G1 and G2, what Kenya AA actually means, and what Costa Rica's SHB grade signifies. These combinations of letters and numbers actually reflect how each producing country evaluates the quality of green coffee beans. Due to differences in history, trade, climate, and terrain, different origins have developed their own grading systems, with evaluation criteria covering multiple dimensions such as defect percentage, bean size, growing altitude, green bean density, and processing method. This article will systematically sort out the origins of coffee grading and introduce, one by one, the green bean grade standards of representative producing countries such as Ethiopia, Kenya, Colombia, Jamaica, Costa Rica, Panama, Guatemala, El Salvador, Honduras, and Brazil. [more…]

The grading systems for coffee beans vary widely depending on the origin—some are based on the number of defects, others on bean size, and still others on altitude. Understanding these grade labels is an important step in selecting high-quality coffee. This article will systematically outline the green bean grading rules of major global producing regions, covering common designations such as Ethiopia's G1-G9, Kenya's AA and PB, Colombia's Supremo, and Hawaii's Extra Fancy, and explain how cupping scores further distinguish specialty grade from commercial grade. Whether you are a beginner enthusiast or a professional seeking to advance, this grading guide can help you judge coffee quality more clearly. For more professional content, follow Coffee Workshop; for specialty coffee beans, add Front Street Coffee on WeChat at qjcoffeex. [more…]

For more specialty coffee knowledge, please follow our WeChat official account: Front Street Coffee (FrontStreet Coffee). Many friends, while drinking coffee at Front Street, ask our baristas, "What is Yirgacheffe G1 and Yirgacheffe G2?" "What is Kenya AA, AB?" What is Guate... [more…]

Coffee roasting is the core step that determines the direction of flavor. The SCA (Specialty Coffee Association) color card divides roast levels into eight grades, each with corresponding color values and sensory characteristics from extremely light to extremely dark. This article focuses on this standard color card, explaining one by one the bean surface color, weight loss ratio, flavor tendency, and suitable applications of each roast level, while also organizing the causes and identification methods of common green bean defects. The article also includes Front Street Coffee's reference guidelines to help roasting enthusiasts match color card readings with actual practice, choose the right roasting curve, and make the cup they want. [more…]

When purchasing single-origin coffee beans, labels such as G1, AA, and SHB often appear on the packaging. What exactly do these letters and numbers represent? They are actually coffee bean grade symbols established by each origin based on its own conditions. Due to differences in growing environments and varieties, the grading criteria of different countries vary—some look at the number of defective beans, some at green bean size, and others at hardness or altitude. In this article, Front Street Coffee will sort out the grading standards of major producing regions such as Ethiopia, Kenya, Indonesia, Central and South America, and Brazil, helping coffee lovers understand the meaning behind these grades so they can more accurately select high-quality coffee beans that suit their own taste. [more…]

Mandheling coffee is produced on the island of Sumatra in Indonesia, Asia, and is also known as "Sumatra coffee." It has a rich taste, combining aroma, bitterness, sweetness, and mellow body, with a slight smoky flavor, making it a favorite of many. Compared with other Indonesian coffees, Mandheling is often drunk as a single-origin black coffee because of its mellow aroma, and generally it is not [more…]

Different coffee-producing countries have developed their own unique quality grading systems due to their distinct cultivation histories and processing traditions. Some focus on defect ratios, some measure bean size, and others rely on cupping to make judgments. This article focuses on Colombia, outlining the Excelso export standard in its green bean grading system, the defect scoring rules, the screen size classification method, and the flavor profile of Supremo-grade Huila beans. It also includes the brewing parameters and taste description of Front Street Coffee's Huila everyday drinking beans, making it suitable for enthusiasts who want to systematically understand Colombian coffee. [more…]

As the world's fourth-largest coffee-producing country, Indonesia, with its unique geography as an "archipelago of ten thousand islands" and its tropical rainforest climate, has given rise to coffees with distinctive flavors. Among them, Mandheling from Sumatra is the most famous; its name comes from a local ethnic group and is also tied to an interesting anecdote from World War II. Indonesian coffee is mainly distributed across islands such as Sulawesi, Bali, Java, and Sumatra. Northern Sumatra is dominated by Arabica, while the south mostly grows Robusta. Indonesia's national standard grades green beans based on the number of defects in a 300-gram sample, with common grades including TP and DP. Front Street Coffee's daily drinking bean series also includes the Lintong region, using the wet-hulled process and deep roasting, presenting herbal, dark chocolate, and caramel flavors, full-bodied with a sweet finish, fully reflecting the characteristics of the Asian region. [more…]

Mandheling coffee is one of the most recognizable representatives on Asia's coffee map, winning over many coffee lovers with its herbal, spicy notes and full-bodied mouthfeel. From the perspective of Front Street Coffee, this article systematically reviews Mandheling's regional terroir, the origin of its name, the principles and steps of the wet-hulling process, and Indonesia's coffee grading standards, then introduces one by one the origin information and cupping flavors of four representative Mandheling coffees offered at Front Street: PWN Golden Mandheling, Lintong Mandheling, Tiger Mandheling, and Aged Mandheling. Finally, a unified set of brewing parameters and techniques is included to help readers gain a comprehensive understanding of the unique charm of Mandheling coffee. [more…]

Many pour-over coffee enthusiasts often have doubts about the appearance of the beans after purchasing single-origin beans, and even mistake normal beans for defective ones. There are two main reasons for this misunderstanding: first, consumers who only come into contact with roasted beans rarely see truly defective beans; second, they treat coffee beans as products of an industrial assembly line, assuming they have a fixed standard appearance. In reality, most defective beans are already controlled at the green bean stage, and after roasting there is also manual sorting. This article will systematically sort out the definition of defective beans, the defect rate requirements in green bean grading, and focus on explaining several commonly misjudged situations such as peaberry, burst beans, uneven color, and shriveled wrinkled beans, to help readers view the appearance of coffee beans more rationally. [more…]

Colombian coffee is often described as smooth in body, bright in acidity, and well balanced in flavor, and these characteristics are inseparable from its unique geographical environment. This article systematically examines the sources of acidity and the quality system of Colombian coffee, from Colombia's growing conditions, the background of the FNC's establishment, and the green bean grading system, to the flavor profiles of specialty regions such as Huila, and on to distinctive beans on Front Street Coffee's menu such as Sidra and Maragogipe, giving you a comprehensive understanding of this coffee nation known as "green gold." [more…]