Hope for the selection and purchase of quality coffee beans

Hope, that is, observation, through careful observation, we can well judge the grade of the coffee bean itself, whether it has been blended, and so on, and then combined with smelling, we can also know whether the coffee bean is fresh, so hope can be said to be the most important and basic part of the four methods of hope, smell, question and cut. The following is a detailed description of what you want to look at and how to look. Phellodendron mandshurica (Thunb.)

Look for packaging

At present, the mainstream coffee packaging on the market are: aluminum foil bag packaging with one-way breathable valve, vacuum packaging, inert gas packaging and environmental protection packaging.

The packaging of one-way breathable valve is the mainstream packaging bag used for freshly roasted coffee, with low packaging cost, simple process, and can well preserve the freshness of coffee in a short period of time, so domestic manufacturers often choose this kind of packaging. if the coffee beans are fresh enough (preferably within a month, at worst within three months), then this kind of packing bag is a good choice.

Vacuum packaging is also jokingly known as brick coffee, mostly coffee powder, because the fresh coffee itself will continue to release gas in about 2 weeks, so there is an aging process if vacuum is needed. This is doomed that vacuum coffee is difficult to ensure its freshness, but the quality of coffee will be reduced to a level in exchange for longer preservation time.

Filled with inert gas packaging is a more expensive packaging method, inert gas filling makes the oxidation process of coffee beans become slow, ILLY is the use of this method of packaging, it can indeed achieve a good effect of keeping fresh, but another problem is that once the coffee beans preserved by this method are opened, the oxidation rate will become very fast.

Environmental protection packaging is widely used in foreign countries, but it does not seem to be suitable for China's national conditions. As many foreign coffee shops themselves produce and sell themselves, and consumers consume coffee very quickly, they can completely ignore the tightness of taboo packaging and use paper bags as packaging bags. however, in China, from the production link to the sales link and then to the final consumer hands, its cycle is longer, so environmental packaging can not become the mainstream in China.

Bean type

Coffee beans are not the bigger the better. for a single variety of unblended coffee beans, there is no doubt that the first choice is uniform granulation, of course, a few varieties, such as some coffee beans in Ethiopia, where the coffee beans themselves vary in size due to local production processes and product standards.

Look at bean color

Like the bean type, for a single variety of unblended coffee beans, the more uniform the bean color, the better. if the bean color is different, there are several possibilities, either the raw beans selected by the coffee beans are old beans, resulting in uneven water content of the raw beans; or the merchants have been blended and are not pure coffee beans; or there are problems in baking and the dehydration time is not enough. Or the grade of the raw bean itself is lower, in short, no matter what the reason is, it is disadvantageous to the quality of the coffee bean.

Hope grease

Coffee beans will produce oil, coffee oil not only reflects the baking degree, but also can be used as an important reference index of coffee freshness. If the coffee is roasted deeply, the coffee beans will be oiled as soon as they come out of the oven, and the coffee oil will slowly volatilize over time, so the oil from the deep-roasted coffee beans is an important sign of relative freshness. On the other hand, the medium and shallow roasted coffee beans generally take some time to oxidize before they produce oil, so the oil from the medium-baked coffee beans is not fresh, but the situation will be a little more complicated. because the shallow roasted coffee has no oil, that is, the oil may have volatilized or roasted, the shallow coffee will not produce oil at all, so we must combine all aspects to judge comprehensively. By looking at the above four points, we can lay a good foundation for judging the freshness and quality of coffee beans.