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Types of Coffee Defect Beans and Their Formation Causes - How to Select Defective Coffee Beans and Differences Between Good and Bad Beans
Have you ever wondered why coffee beans go bad? What are the defects in green coffee beans? Why do they develop such defects? Today, FrontStreet Coffee will take you through the various types of defective beans and the causes behind their formation! Coffee processing typically begins on the same day as harvesting to prevent unnecessary fermentation that could alter the chemical properties of the coffee beans. This
2021-07-17 coffee defects types formation causes how to select coffee beans quality differences -
SCA Arabica Coffee Green Bean Grading Manual_ How to Grade Arabica Coffee Beans?
Professional coffee knowledge exchange For more coffee bean information Please follow Coffee Workshop (WeChat public account cafe_style) [SCAA Specialty Coffee Green Bean Standards] SCAA green bean defects are divided into two major categories: Class I and Class II defects. The requirements for specialty coffee grade are: No Class I defects; No more than 5 Class II defects
2018-09-16 SCA Arabica coffee green beans grading manual coffee beans how to distinguish grades -
What Causes Jagged Patterns in Latte Art? Solutions for Unclear Latte Art Designs
Some friends have asked FrontStreet Coffee for help, "Why is it suddenly difficult to pour clear latte art patterns recently, and why do the designs show obvious jagged edges?" Regarding this issue of "jagged patterns" in latte art, every barista who has ever poured latte art has likely experienced it. Many baristas feel at a loss when encountering this situation, often blaming it on their own poor performance
2022-09-03 latte art jagged patterns coffee techniques barista tips espresso art -
What Causes Espresso Machine Leaks? Why Do Coffee Machines Drip During Espresso Extraction?
Recently, many friends have provided feedback to FrontStreet Coffee's backend: "Espresso machines often experience leaking during the extraction process." This issue is actually easy to resolve once we understand the underlying principles. Normally, during espresso extraction, water within a sealed space is only subjected to pressure from the coffee machine
2025-01-19 espresso machine leaks coffee machine dripping espresso extraction coffee equipment troubleshooting barista maintenance -
What Causes Coffee to Be Bitter? The Origins of Coffee Bitterness and How to Avoid Overly Bitter Coffee
Bitterness has become a dreaded word in the specialty coffee industry. We all know that good coffee should be sweet and balanced, perhaps with a hint of acidity, and definitely shouldn't need sugar to make it palatable. What causes coffee to become bitter? Is it always that bad? Is bitterness always undesirable? In fact, bitterness isn't always a bad thing. Actually, if you
2025-07-05 bitterness coffee causes avoid quality -
What Causes Uneven Flow Distribution When Extracting Espresso? What's the Difference Between Bottomless and Split-Flow Portafilters?
Before bottomless portafilters were invented, baristas primarily used portafilters with spouts when extracting espresso. These portafilters mainly come in two types: single-spout portafilters designed for single-shot baskets, and split-flow portafilters for double-shot baskets. The so-called split-flow portafilter refers to the type shown in the picture below, featuring
2025-06-07 espresso extraction uneven flow bottomless portafilter split-flow portafilter coffee brewing -
Causes and Solutions for Green and Bitter Tastes in Pour-Over Coffee Brewing - Recommended Coffee Beans That Aren't Astringent
While coffee richness may not be immediately apparent, unpleasant sensations like sandy, rough astringency are easily detectable. Therefore, we need to understand and prevent such occurrences. As FrontStreet Coffee has mentioned in previous articles, astringency is not a taste but rather a mouthfeel
2022-02-27 pour-over coffee bitter taste green astringency coffee brewing coffee beans FrontStreet Coffee -
Does Pour-Over Coffee Also Have Channeling Effects? What Causes Slow Water Flow and Water Pooling in Pour-Over Coffee?
For professional coffee knowledge exchange and more coffee bean information, please follow Coffee Workshop (WeChat public account: cafe_style). How do turbulence and agitation affect the flavor of pour-over coffee? Pour-over coffee is truly wonderful! You can watch the water flow elegantly during brewing, while well-brewed coffee becomes a crystal-clear liquid,
2023-01-05 pour-over coffee channeling effect slow water flow causes professional -
What Causes the Center to Collapse After Blooming in Pour-Over Coffee | A Brief Analysis of the Depression Pit Formation in Pour-Over Coffee
For professional coffee knowledge exchanges and more coffee bean information, please follow Coffee Workshop (official WeChat account: cafe_style). That's right, we all love pour-over coffee! Pour-over coffee possesses infinite charm, not just in its ritualistic process, but also in the delightful enjoyment that well-extracted pour-over coffee brings us, just like handcrafted coffee does.
2022-10-28 pour-over coffee blooming center collapse what causes analysis formation depression -
Why Does Pour-Over Coffee Often Become Over-Extracted and Bitter? Causes and Solutions for Coffee Over-Extraction
In the world of pour-over coffee, there are friends who jokingly call themselves "masters of over-extraction" (meaning they have mastered various brewing methods that result in over-extracted coffee). Of course, if a cup of coffee is described as "over-extracted," it definitely means some unpleasant flavors have appeared. Typically, an over-extracted coffee will exhibit burnt or mixed bitter tastes
2023-01-14 over-extraction bitter coffee pour-over coffee brewing methods coffee extraction -
Ethiopian Coffee Growing Conditions: An Analysis of the Causes of Acidity in Natural Process Yirgacheffe
Professional coffee knowledge exchange. For more coffee bean information, please follow Coffee Workshop (WeChat public account: cafe_style). FrontStreet Coffee - Natural Process Yirgacheffe and brewing parameters sharing. Ethiopia has consistently provided some of the world's highest-regarded single-origin premium coffee beans. Generally, Ethiopian coffee is renowned for its fruity, wine-like characteristics and distinctive wild acidity. Ethiopia cultivates
2019-12-28 Ethiopia coffee growing conditions natural process Yirgacheffe acidity causes -
Common Latte Art Mistakes: Causes and Solutions for Coffee Pouring Errors
For more professional coffee knowledge and coffee bean information, please follow Coffee Workshop (WeChat official account: cafe_style). Beyond simply adding regular milk to coffee, beginners often make several mistakes when pouring latte art: pouring milk too quickly
2023-01-10 coffee latte art mistakes common errors pouring techniques professional coffee knowledge -
Causes of Inconsistent Espresso Extraction - Does Espresso Grinder Bean Hopper Pressure Affect Coffee Flavor?
This situation is particularly noticeable in busy coffee shops. After completing all morning preparations, filling the bean hopper, and adjusting the day's espresso extraction parameters, as espresso extraction volume increases, you'll notice the flow rate becomes faster and extraction time is several seconds shorter than the planned parameters. Normally, a stable reference point is expected...
2025-07-30 espresso extraction espresso grinder bean hopper pressure coffee flavor extraction consistency -
Why Does Freshly Made Latte Foam Collapse? Causes and Solutions
When evaluating the quality of a latte, in addition to taste, texture, blending uniformity, and the smoothness of the surface, another important criterion is the stability of the milk foam. The decomposition of foam on a latte's surface begins at the very moment the espresso extraction is complete and the milk foam is properly frothed. Measuring the stability of latte foam is therefore
2022-10-07 latte foam coffee stability espresso extraction milk frothing -
Why Does My Brewed Coffee Taste Sour? Why Is Pour-Over Coffee So Acidic? What Causes Under-Extraction in Coffee?
Recently, more and more friends who previously only drank dark roast coffee have started exploring light roast coffee with its acidic notes. As specialty coffee culture becomes more widespread, everyone wants to experience the elegant floral and fruity aromas from their coffee. However, unlike dark roast coffee, light roast coffee has a much higher chance of brewing failures, so people often encounter
2025-01-04 coffee acidity pour-over coffee under-extraction coffee brewing light roast coffee -
What is Coffee Channeling? Why Does Espresso Experience Channeling? What Are the Causes and How to Solve It?
FrontStreet Coffee frequently mentions "channeling" in our articles because during the coffee extraction process, channeling negatively impacts coffee flavor. And it occurs quite frequently! So today, FrontStreet Coffee will share with you what channeling actually is and how to address it!
2024-09-03 coffee channeling espresso extraction coffee brewing problems coffee science barista techniques -
What Causes Coffee Over-Extraction and Under-Extraction: Understanding Coffee Extraction
Defining what makes a cup of coffee good may vary according to each person's taste preferences. Some love floral notes, others prefer fruity undertones, while some favor dark chocolate and nutty flavors. However, when it comes to undesirable flavors, most people can reach consensus, such as dry, astringent acidity, burnt bitterness, or mixed woody tastes. In the world of pour-over specialty coffee
2023-07-19 coffee extraction over-extraction under-extraction coffee brewing coffee flavors -
Which Coffee Beans Are Not Sour or Bitter_Causes of Bitter Coffee Beans_How Much Does a Package of Non-Bitter Coffee Beans Cost
Professional coffee knowledge exchange For more coffee bean information Please follow Coffee Workshop (WeChat official account cafe_style) Starbucks opened the door to coffee for Chinese people, but while opening the door for you, it also closed the window. Chinese people were deeply poisoned by the bitterness of Starbucks coffee. Thus came the so-called coffee = bitter During the coffee bean roasting process, a substance called chlorogenic acid lactone is broken down
2018-09-04 which coffee beans not sour not bitter bitter causes how much package professional coffee -
Are Wrinkled Coffee Beans Defective? What Causes Oily Surfaces on Coffee Beans?
Why are coffee beans wrinkled on the surface? Are they bad beans? The coffee beans look oily - how long have they been stored? These are common questions customers have about coffee beans! FrontStreet Coffee will address these concerns in this article. Why do coffee beans develop wrinkles? Most people expect coffee beans to have smooth surfaces, so those wrinkled lines might seem concerning.
2021-04-11 coffee beans surface wrinkles defects defective oily causes why coffee beans coffee -
Why is Espresso Hard to Dial in on Rainy Days? What Are the Causes of Poor Espresso Extraction from Coffee Machines?
As temperatures gradually rise and frequent rainy weather arrives, this means Guangdong has already stepped into the realm of spring. Do you think FrontStreet Coffee is going to praise this season of revival? No! In these continuous spring rains, for those who have to work early shifts and dial in coffee early, it will be a time of drinking espresso until satisfaction
2025-02-07 espresso extraction rainy day coffee espresso machine brewing challenges weather effects on coffee