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Why Is There Oil Floating on Cold Brew Coffee? Extraction Principles of Cold Brew
As summer heat intensifies and body temperature rises, FrontStreet Coffee has received many questions about cold brew preparation. As one of the simplest brewing methods for home use, cold brew coffee only requires a sealed container and a sufficiently cold extraction environment. After several hours of steeping, you can obtain a full-flavored cup of coffee
2023-06-12 cold brew coffee oil floating extraction principles cold coffee extraction -
Are Coffee Grease Filter Cups Useful? Why Does Espresso's Crema Taste Bitter? What Does Espresso Crema Mean? How to Make Delicious Americano Coffee?
From time to time, interesting coffee gadgets appear on the market. For example, LilyDrip, which can change the filter bed structure, or Paragon, a device for rapidly cooling coffee liquid. These tools affect coffee in various ways, ultimately influencing what we drink
2025-08-28 coffee grease filter cup espresso crema bitter crema americano coffee coffee brewing coffee equipment -
Why Does Oil Appear in Coffee After It Cools? What Are the Oils in Pour-Over Coffee, Cold Brew Coffee, and Siphon Coffee?
Have you ever noticed this phenomenon: when a cup of pour-over coffee is left undrunk for a while, a thin layer of "oil" always appears on its surface. What exactly is this "oil"? Is it some kind of deterioration in the coffee? What exactly is the "oil" that appears after coffee cools?
2024-03-06 coffee oils cooled coffee pour-over coffee cold brew coffee siphon coffee -
Does Pour-Over Coffee Have Crema and Foam? What Does the Foam in Pour-Over Coffee Taste Like?
Observant coffee enthusiasts may have noticed that when brewing coffee, a layer of foam floats on the surface of the liquid in the filter cup. This foam varies in appearance depending on the beans used and brewing time—sometimes appearing rich and abundant, other times quite sparse, occasionally presenting a brownish-yellow hue, and sometimes manifesting in different shades altogether.
2022-08-28 pour-over coffee coffee foam crema coffee extraction coffee brewing -
What is Tiger Stripe Espresso? Where Does Espresso Crema Come From? How Do Fine Grinds Affect Coffee?
Today while FrontStreet Coffee was browsing online, we discovered an interesting question post. A netizen shared a photo of their extracted espresso and asked: Why are there 'oil droplets' on the surface of the espresso crema? (Reference image below) As we can see from the image above, there are indeed floating particles on the crema surface
2024-12-01 espresso crema tiger stripe coffee extraction fine grinds -
How to Use the Filter Screen of a Cold Brew Coffee Maker? How to Filter Coffee Grounds Thoroughly?
Experienced coffee enthusiasts know that many factors influence the taste of cold brew coffee. Among these, the most significant are coffee bean selection, grind size, coffee-to-water ratio, and steeping time. Secondary factors include brewing techniques such as thorough stirring, ensuring clean containers, water quality, and other details that或多或少都会改变咖
2025-09-15 cold brew coffee coffee filter coffee grounds brewing techniques -
Fine or Coarse Coffee Beans: Which Produces More Oil | Factors Affecting Coffee Crema Generation | Which Coffee Beans Have More Crema
Professional coffee knowledge exchange. For more coffee bean information, please follow Coffee Workshop (WeChat official account: cafe_style). It seems that when everyone tastes espresso, they pursue perfect coffee crema - the brown foam floating on freshly brewed espresso. Just the right amount of coffee crema has become synonymous with a good cup of coffee, but this dense layer contains more
2018-08-31 coffee beans fine or coarse oil production factors affecting coffee crema generation which type professional -
Espresso Basics: What is Crema
During the roasting process, coffee beans generate large amounts of carbon dioxide. Most of this gas dissipates during cooling, while a small amount remains trapped within the beans. Grinding releases these gases, which is why coffee must be prepared as quickly as possible after grinding. When hot water impacts coffee grounds under high pressure, it emulsifies the insoluble oils from the coffee grounds
2025-07-06 espresso basics fundamentals crema roasting process coffee -
Why is Espresso Crema So Bitter? How to Drink It Correctly? Tasting Espresso
The golden foam floating on top of espresso is what we call Crema. People have a common view of it - "It's the soul of espresso! It can be thick, but not thin!" Although people call it the "soul" of espresso, anyone who has tasted it alone knows
2023-12-20 espresso crema bitter coffee tasting how to drink espresso -
Which Coffee Filter Paper Brand is Best? Features of Non-Woven Filter Paper & Choosing the Right Filter for Pour-Over Coffee
Filter paper stands as the quintessential filtration tool in contemporary pour-over coffee brewing. It delivers exceptional filtering performance while remaining remarkably budget-friendly. Furthermore, its disposable nature allows for immediate discard after use—eliminating the need for cleaning and providing unparalleled convenience. These three distinct advantages have established filter paper as
2025-07-27 coffee filter paper pour-over coffee non-woven filter paper coffee brewing filter paper brands -
What is the foam in pour-over coffee? Are white bubbles a sign of over-extraction? What's the relationship between espresso's golden crema and foam?
When making pour-over coffee, we always see many bubbles on the surface due to carbon dioxide, right. But have you noticed that these bubbles sometimes appear different? During the brewing process, the foam color varies from brownish-yellow to white; or at different times
2024-03-04 coffee pour-over foam crema over-extraction espresso bubbles -
What to Do About Excessive Coffee Bean Crema_What is Coffee Bean Crema_Can Crema Damage Coffee Machines
Professional coffee knowledge exchange For more coffee bean information please follow Coffee Workshop (WeChat official account cafe_style) Crema is a signature brown foam that floats on freshly extracted espresso. While crema is one of the main characteristics of a good espresso, it has several other effects on espresso. However, regarding
2018-09-21 coffee beans crema what to do what is cause coffee machine damage professional coffee -
What to Do When Espresso Lacks Crema, and What Is Espresso Crema Made Of?
What is espresso? Espresso is a very small volume of coffee that can be finished in just two or three sips. Its flavor is extremely intense, which many people find difficult to accept. The small serving size and strong flavor are reasons why espresso has limited popularity in China. However, when mixed with milk to make latte or with water to make Americano, these beverages become much more approachable and widely enjoyed.
2025-06-11 espresso crema espresso brewing coffee extraction crema formation espresso troubleshooting -
Coffee Bean Roast Level Classification - Italian Roast Coffee Characteristics? How to Brew Italian Roast Beans?
Professional coffee knowledge exchange for more coffee bean information please follow Coffee Workshop (WeChat public account cafe_style) Coffee bean roast level classification Italian Roast Coffee coffee bean characteristics? How to brew Italian Roast beans? Coffee roasting methods are generally divided into the following eight stages. Very Light Roast (LIGHT Roast): Roast degree; extremely light roast,
2018-08-24 coffee beans roast level classification Italian Italian Roast Coffee -
The Difference Between Americano and Espresso? How Espresso Bean Roast Level Affects Coffee Flavor
Authentic Americano coffee Italians refer to coffee made with espresso as a base and then diluted with water as Americano, but in fact, the real Americano, which is the coffee most commonly drunk by Americans, is actually drip coffee. "Welcome to the US, Do you want an Americano?" From this sentence, you can see
2017-09-11 Americano coffee espresso what difference each unique characteristics beans authentic -
Pour-Over Coffee Foam: More or Less, Is It Normal to Have Bubbles on Coffee?
When brewing coffee, have you ever wondered what the foam on the surface is made of? Sometimes this foam appears dense and abundant when brewing certain coffees, while when brewing others, the foam seems scarce. What exactly causes this difference? FrontStreet Coffee has discussed this in previous articles - in the water pouring after the bloom
2021-11-21 pour-over coffee coffee foam coffee bubbles coffee brewing -
Starbucks Oleato Olive Oil Coffee Launches in the US! Netizens Criticize: Is This Lard Coffee?!
For professional coffee knowledge exchange and more coffee bean information, please follow Coffee Workshop (WeChat official account: cafe_style). For more specialty coffee beans, please add FrontStreet Coffee's private WeChat account: qjcoffeex. Last month, Starbucks suddenly unveiled its "attention-grabbing blockbuster," launching something that the entire coffee industry could never have imagined...
2023-03-30 Starbucks Oleato olive oil coffee US launch netizens criticism coffee industry -
Why Pour-Over Coffee Lacks Crema: What Is Coffee Crema and Why Do Coffee Beans Produce Oil?
Why doesn't pour-over coffee have crema? Is it because the beans aren't fresh? Recently FrontStreet Coffee noticed this discussion topic. Pour-over coffee isn't completely without crema—while not visually prominent, it manifests in the mouthfeel. What is coffee crema? When speaking of coffee crema, what perhaps first comes to mind is the golden-tinged oil atop espresso
2025-06-11 Pour-over Coffee Why No Crema What Coffee Beans Produce Oil -
Is the Golden Foam of Espresso Actually Coffee Oils or Crema? Are Thicker Oils Better?
Recently, in the article "Why Do People Like the Bitter Crema in Espresso?", FrontStreet Coffee mentioned that this layer of golden foam extracted by espresso machines is called Crema/coffee oils. This led some friends to ask: Is it Crema or coffee oils? I can first
2024-01-19 espresso crema coffee oils golden foam espresso extraction -
Are Oily Coffee Beans Good or Bad: Which Coffee Brands Have More Oils
Professional coffee knowledge exchange. For more coffee bean information, please follow Coffee Workshop (WeChat official account: cafe_style). Some people believe that oils are an indispensable part of coffee flavor, but there are also concerns about the health risks associated with these coffee oils. Are oily coffee beans good or bad? Should you choose coffee beans that appear oily or non-oily on the surface? This time from coffee bean oil
2018-09-21 oily more coffee beans good which brands