What effect does silver skin have on coffee? What does the silver skin of coffee taste like?

[Foreword]

When grinding washed beans, often found a little more silver skin, some friends think silver skin has astringent taste, screen out the silver skin in coffee powder in advance, and then extract, otherwise silver skin will affect the flavor of coffee. Is it like this? Today, let's explore whether silver skin enhances the bad flavor?

First of all, let's first understand the structure of coffee beans, where is the silver skin?

The surface of each coffee bean has a thin outer film, the sun treatment of silver skin is generally yellow brown, washing treatment of silver skin is generally beige, translucent state, tightly wrapped with coffee beans, so under normal circumstances we see coffee beans or beans themselves color, this film is called silver skin. In the coffee fruit, the outer layer of silver skin is covered with a layer of yellow skin, called endocarp. The whole bean is encapsulated in a viscous pulp, forming a soft, sweet pulp with an outer shell.

There is also a thinner film inside the parchment that wraps the coffee beans, which is used to calling "silver skin" because of its glossy and silvery color. This silver skin will peel off during baking. The ground coffee is usually ground with silver flakes, which are silver flakes that fail to peel off the beans during roasting. Left on the surface of the coffee bean, we call this part of the silver skin the outer silver skin, and the silver skin in the coffee bean crevice is generally left in the coffee bean, generally we call the silver skin in the crevice the inner silver skin.

From the perspective of raw beans:

Sun-baked beans have relatively more silver skin, drying and refining method only removes the coffee shell, and the silver skin is still intact; while washed beans have less silver skin, washing and refining method generally removes the silver skin on coffee beans during its processing, showing a special luster.

Looking at the beans:

During the baking process of sun-dried beans, the "outer silver skin" of the sun-dried beans will fall off at the same time as the moisture is discharged, and will be discharged to the silver skin collection barrel along with the air circulation in the boiler of the baking machine; while the "inner silver skin" in the middle of the washed beans cannot easily fall off and remains in the center.

[Sunburn Berry Orchard]

[Washed Benafka]

Why keep the silver skin for processing?

The inner silver peel deeply participated in the fermentation at the initial processing stage of green beans, accompanied by regional flavor attributes, and generally had sweet feeling. After the baking process, the inner silver peel and the bean itself work together to build up the full flavor of the origin.

Expressed in Baking?

In baking, if the outer silver skin is not discharged in time, it will be burnt by the high temperature in the boiler. After baking, when the outer silver skin with obvious charred state is extracted under the same conditions, it will feel astringent. A baker with basic knowledge should know when the outer silver peel will fall off in a concentrated manner and use the damper to let it drain.

Different processing methods adopt different baking degrees, and the effects produced are also different. Generally washed coffee beans, if not deeply roasted, the silver skin remaining in the center line still exists. Sun-baked coffee beans, although the silver skin is intact when processed, disappear after roasting. The darker the roast, the darker the coffee beans.

How did he perform in [Grinding]?

The washed beans have more silver skin, which will remain a lot after baking, and appear more when grinding; the sun-dried beans have relatively more silver skin, which is more thoroughly removed when baking, so it is relatively less when grinding. Of course, it had a direct relationship with the baking degree. The deeper the baking, the cleaner the silver skin would be.

What does silver skin smell like?

Brewing: 90 degrees water, 1g silver skin, light golden yellow color

Flavor: When drinking, like Kudingcha, slightly sweet rice flavor, tea sense is obvious, bitter taste is not obvious.

So, does silver skin affect flavor?

Compare sunberry orchards with washed benafica:

[Sunburn Berry Orchard]

Water temperature: 89 degrees

Beans: 15g

Powder water ratio: 1:15

Total duration: 1:58 seconds

Technique: three-stage brewing, 30g stewed for 30 seconds, the first section of small water injection, slowly circling, to 125g pause, and so on, when the liquid level dropped to 1/3, then water injection to 225g, water flow is larger, faster circling speed

Flavor: Intense berry and dry fruit aromas, strong strawberry, blueberry with passion fruit, mango and other tropical fruit aromas at the beginning, apricot, peach and grape juice flavors in the middle, floral, peach, berry aromas throughout the taste buds, a little nutty finish.

[Washed Benafka]

Water temperature: 90 degrees

Beans: 15g

Powder water ratio: 1:15

Total duration: 2:05 seconds

Technique: three-stage brewing, 30g stewed for 30 seconds, the first section of small water injection, slowly circle, to 125g pause, and so on, the liquid level dropped to 1/3, then water injection to 225g, water flow is larger, circle speed is faster

Flavor: Fresh and charming coffee flower with lemon sweet aroma, a taste can feel sour and sweet yogurt, citrus, fresh lime, bergamot, lychee outline the whole outline, orange blossom and peach embellishment in the middle, the end with spice, flower and Earl Grey tea flavor.

Conclusion: After brewing, it was found that whether to retain the silver skin for brewing did not have much bad effect on the overall flavor. Sun-dried beans have less silver skin, which is not obvious when tasting, while washed beans have more silver skin, which enhances the tea feeling in the aftertaste, and does not have the bitter taste of the legend. It is not necessary to screen out the silver skin when brewing, but to retain it instead increases the sense of hierarchy. Share it with everyone here today.