What is the silver crust of coffee? Will silver skin affect the flavor of coffee? The solution of multi-silver skin of coffee powder

Some friends reflected in the street that after grinding the coffee beans into coffee powder, the coffee powder was mixed with a lot of yellow and white crumbs. What on earth are these crumbs? Will it affect the flavor of the coffee?

The last layer of "skin" of coffee beans, these yellow-and-white crumbs, is actually silver skin, which is also the last "protective film" of processed raw coffee beans. Just like a peanut jacket wrapped in peanuts, when it was still a raw bean, the silver skin was tightly attached to the coffee bean and did not fall off easily. After baking, the silver skin would peel off from the bean body. Why is there silver dandruff in coffee powder? Although the silver skin will fall off during baking, some coffee beans will have some silver skin left. The amount of silver residue after baking has a lot to do with the treatment of coffee beans. If you often buy different kinds of coffee beans, you will find that some coffee beans have a "white line" in the middle, while others do not. You can refer to the following picture of the front street, sun-treated coffee beans on the left and washed coffee beans on the right. The biggest difference between them is the "white line" in the middle, and this "white line" is the silver skin left on the coffee beans.

The silver skins of sun-treated coffee beans remain intact when they are raw, so the whole piece of silver skin falls off completely during baking (there will also be trace amounts of silver dandruff). On the other hand, the silver skin of the washed coffee beans is not complete, and the silver skin is fragmented and shedding when baking, and some of the silver skins in the middle of the coffee beans are more difficult to fall off, forming a "white line" in the ripe beans. Therefore, the final amount of silver skin of cooked coffee beans has little to do with the roasting technology, mainly depends on the handling of coffee beans. Will silver dandruff affect the flavor of coffee? Many friends worry that too much silver skin will affect the flavor of coffee. Qianjie used to be skeptical to verify the problem. First of all, Qianjie first tasted the taste of silver skin soaking water, and the feedback was sweet corn, wheat, sweet, and no bitter taste.

Secondly, the front street through the removal of silver skin brewing and non-silver skin brewing flavor comparison, through the form of hand brewing feedback is that the flavor of the two cups of coffee beans is basically the same, there is no significant difference. In other words, the residual silver skin of coffee beans will not affect the flavor of coffee.