How to quickly identify the freshness of coffee beans? What is the effect of defective beans on coffee?

The knack of distinguishing the freshness of coffee beans

Nose smell: fresh coffee beans smell strong fragrance, otherwise tasteless or bad smell.

Look at it: good coffee beans are complete in shape and full in size. On the contrary, the shape is incomplete.

Hand pressure: fresh coffee beans are fresh and crisp, and the fragrance comes out when they crack.

Color: dark black coffee beans, the coffee brewed has a bitter taste; yellow coffee beans, the coffee brewed has a sour taste.

Judgment of appearance

Delicious coffee can be known from the shape of its roasted coffee beans, as shown in the picture. Of course, there can not be bad coffee beans mixed with, it should be noted that normal beans will also be mixed with high-quality coffee beans and cause hindrance, brewing delicious coffee fried roasted beans, first of all, the beans must be big and fat, and uniform, followed by the same size and no color spots. These are the main points of visual discrimination, if you look carefully, it should not be difficult to distinguish.

Fermented beans: coffee beans that fall from the soil before harvest. The sour smell will have a great impact on the taste of coffee.

Dead beans: also known as unripe beans, or affected by climate and other factors, imperfect development, fried spots will be produced after baking, so that the coffee has a green and astringent taste. Black beans: fermented beans, rotten, blackened coffee beans. Because it is black, it can be distinguished from normal coffee beans at a glance.

Borer beans: coffee beans eroded by insects

Defective beans: may be stuck during work, or carelessly handled during handling, resulting in incomplete coffee beans. Will cause fried spots when baking, and will produce bitter and astringent taste.

Others: remaining thin-skinned beans, stunted beans, dried beans that do not completely produce sour taste, shell beans with only shell, etc.

Judgment during grinding

After fully roasting and extracting water, the coffee can be brewed into delicious coffee, which can be judged by grinding. When grinding, good coffee beans will gently make the sound of salad salad, gently shake the hand, the original taste of coffee is overflowing. Shoddy coffee beans have a creaking sound. There is a feeling of sticking during grinding.

Judgment at the time of pawn

The easiest way to make delicious coffee is to sigh the filter paper. When brewing, there is also a way to judge whether the coffee is delicious, that is, whether the powder expands loosely in hot water, and when the coffee is fully roasted and extracted water, there will be beautiful and meticulous foam puffing up.

Judgment after pawn

Although the concentration of coffee will change due to different roasting degree and extraction method, the characteristic of delicious coffee is that the coffee liquid extracted by the pawn is clear under the same conditions. The spoon can be clearly seen through the stroke fluid in the picture below, while the one in the stone picture is almost invisible. It is difficult to tell whether a cup of coffee is delicious, but if you compare it, you can see whether the coffee is delicious or not. even after 30 minutes, the color of a delicious cup of coffee is still clear and the taste will not change.