Does Silver Skin Affect Coffee Flavors?
Contents:
1. What is coffee silver skin?
2.Silver skin cupping test.
Sometime white flakes fall off the coffee beans after grinding. It is the “silver skin” of the coffee beans. Will the silver skin affect the flavor of coffee?
What is coffee silver skin?
What is coffee silver skin? Coffee beans are the seeds of coffee berries. The outer layer of the seeds has a thin film called “silver skin,” because of its lustrous and silvery color. This layer of silver skin usually comes off during roasting. Usually, when the coffee is grinded, there are some silver skins in the coffee powder. These are silver skin that was not peeled off from the coffee beans during roasting. At the central concave line of the roasted coffee beans, a little silver skin will remain, and the white silver skin is easier to see in the washed & lightly roasted coffee beans.
Silver skin cupping test.
In order to understand the intensity of the taste of silver skin, and to understand the influence of a small amount of silver skin on the flavor of coffee, I went to try it myself. I specially took it out from the silver skin collection tube of the roaster to have a look. There are two types of brewing methods: filter method & immersion method + filter method.
The first is filter method:
The V60-02 filter cup is fully filled with 4.5g silver skin and brewing with 103g water. Slowly pouring water to the silver skin, and water flows down immediately without any resistance. It takes 1 minute and 15 seconds to finish the water. The scale weighs 89g, and about 1:20. The color of the liquid is light rose gold, and it has a light wheatgrass taste, but with a slight astringency.
The second method is immersion + filter.
Fill the pot with 9.2g of silver skin, pour 217g of water, soak for 2 minutes and 30 seconds, and then pour into a filter cup with filter paper to filter out the liquid. The liquid weighs 154g, which is about 1:16.7. The color of the liquid is bright burgundy, with a strong wheatgrass taste, astringency, and a bitter aftertaste.
The silver skin peeled off during the roasting process is about 1.23% by weight, which is related to the bean type and processing method. This is the average value of our roasting beans for the past two days. The editor grinded 20g beans (taking Ethiopia Gediyo Dila Golla OCR G1 Washed as an example), as shown in the picture, because the silver skin is too light, it is difficult to separate and weigh it. Among these 20 grams, it is estimated that it accounts for less than 0.1% of the weight. Therefore, in terms of coffee brewing, only 100% silver skin has a little wheatgrass flavor, and less than 0.1% silver skin will not affect the overall flavor.
When you see the grinded silver skin next time, please don't think it's residue. It's not unclean, it's a normal for coffee beans, and it has little effect on coffee taste.
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