Coffee beans roasting knowledge of coffee beans out of oil is good?

Some of the coffee beans in the coffee bar are shiny and glossy, while others are dull. After a while, it was found that the surface of the dull coffee beans also looked glossy. Perhaps friends who often drink coffee at home will also have such doubts: is the oiled coffee bean good? Will it affect the taste of the coffee? Why do coffee beans produce oil? Sometimes this problem can be found in coffee bean stores. Which kind of coffee beans should we buy? Is the appearance of glossy or non-glossy coffee beans?

The editor explained to everyone in detail whether the oiled coffee beans were good or not. The difference between producing oil and not producing oil.

Coffee oil that is not oil:

These "oils" distributed evenly on the surface of coffee beans are actually not "oils", but water-soluble organic substances that look like oils. "Coffee oil" itself contains many aroma ingredients of coffee, which can be dissolved in water, so the surface of your brewed coffee will not be covered with greasy oil. There are two reasons: soy beans.

A stale shallow baked beans b fresh deep baked beans.

A) stale moderately baked beans

The "medium-light baked beans" with light roasting heat and light brown appearance are dry and will not produce oil after baking. About six days after baking, the phenomenon of "dotted oil" begins to appear (dotted oil droplets appear on one side of the coffee bean). Slight "dotted oil" does not mean that it is not fresh, but sometimes the flavor of medium-shallow roasted coffee beans is at its peak. Continue to put, more than two weeks after the oven, the surface of medium-shallow baked beans gradually appeared a layer of bright oil, at this time, the flavor of "medium-shallow baked beans" has begun to decline, should avoid buying.

B) fresh deep baked beans

Deep-baked beans with dark brown appearance show a slight glossy appearance after baking, and a large amount of oil begins to appear on the surface from the second day to the fifth day after baking. The bright-looking "deep-baked beans" not only do not mean that they are not fresh, on the contrary, the deep-baked beans will gradually dry out three weeks after they come out of the oven, and finally become dry-flavored beans. Therefore, if you see coffee beans that are dry but dark brown in appearance, please pay special attention to their baking date, which is most likely to be spoiled beans.

When choosing coffee beans, special attention should be paid to the phenomenon of oil coming out of coffee beans. This article, "how are the oiled coffee beans?" will help those who like to drink coffee to choose the right coffee beans.