Have you ever taken a sip of your morning coffee only to find an oily film on top? Don’t worry, your coffee beans aren’t bad. In fact, having an oil film on your coffee is quite normal. Let’s dive into why this happens and whether you should do anything about it.
Understanding the Oil on Your Coffee
That oily layer on top of your coffee is technically called “coffee scum.” Despite its unappealing name, it’s just the natural oils from the coffee beans rising to the surface. These oils contain caffeine, antioxidants, and about 71 percent unsaturated fat. They contribute to the flavor and richness of your brew.
Factors That Contribute to Coffee Oil
Various factors can cause the oils to gather and create the film on your coffee. Let’s take a closer look at them:
The way you brew your coffee plays a role in the amount of coffee scum you’ll see. Drip brewing, for example, is less likely to produce a film since it uses a filter. On the other hand, methods like French press or Turkish coffee, which don’t use filters and are brewed at high temperatures, are more likely to result in oily coffee.
Extremely hot water, such as when using boiling water for a pour-over method, can lead to higher levels of coffee scum. The higher temperature causes the coffee molecules to bond more effectively. However, since the oil is insoluble, it rises to the top instead of mixing with the other molecules.
If you live in an area with hard water, you may notice more film on top of your coffee. Hard water has a higher mineral content, including calcium. These minerals bond with the fatty acids released by the coffee beans, leading to the oil floating to the surface. While hard water doesn’t cause more coffee scum, it makes it more noticeable.
Different coffee bean roasts have varying oil levels. Flame-roasted beans, for example, tend to be higher in unsaturated fat, resulting in more coffee scum. Dark roasts, in particular, bring these oils to the surface, making the film more apparent.
Coffee Bean Quality
The quality of the coffee beans also affects the presence of oil on the surface. Higher-grade beans, often slowly roasted, exude less oil. This means that there is a lesser chance of a film forming on your cup when using high-quality beans.
Using a brewing method with a filter is the best way to avoid an oily film. However, not all filters are created equal. Filters with activated charcoal are most effective, as they bond to organic impurities, including fats from the coffee beans, reducing the likelihood of coffee scum. If you’re experiencing issues with the film even with a filter, consider switching to a different filter type.
To Film or Not To Film?
So, is an oily film on your morning coffee a bad thing? Not necessarily. Some argue that the oils from the coffee beans contribute to the flavor and overall experience. However, if you prefer to avoid the layer of oil, there are steps you can take. Brewing at lower temperatures, using a better filter, or opting for a higher quality blend or roast can improve the quality of your coffee and reduce the presence of the film.
For a delightful cup of coffee, head over to Marmalade Cafe and explore their range of high-quality blends. Enjoy your morning brew without worrying about unwanted oil!