depending on the grade of wine, some countries will classify red wine into four grades, for example, France divides red wine into four grades, and the best grade is wine from legal producing areas, called AOC for short, and the bottle will be marked with Appellation+ producing area name +Controlee. The second grade is excellent regional table wine, referred to as VDQS, and the bottle will have the logo of Appellation+ name of producing area+Qualite Superior. The third level is regional table wine, which is called VINDEPAYS in French, and the wine bottle will be marked with VindePays+ the name of the producing area. The lowest level is the four-level daily table wine, which is called VINDETABLE in French, and the wine bottle will have the logo of VindeTable. Italy's classification is also four levels, the highest level of DOCG, which means to ensure the legal regional level. The second grade is DOC, which means wine from legal producing areas. The third level is IGT, which means local food and wine level. Level 4 is VDT, which means general table wine.

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looking at the source areas of wine, the sources of red wine are generally divided into "old world red wine" and "new world red wine". Old world red wine refers to some European countries, such as France, Italy, Spain, Germany, etc., which are relatively expensive. New World Red Wine refers to the United States, Australia, Chile, New Zealand, Argentina and other countries. Old world red wine is influenced by the temperature and environment of that year, while new world red wine has a more suitable climate. However, the grape cultivation techniques and wine-making techniques of old world red wine are slightly better.

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To see where the wine comes from, we should not only look at the source of red wine, but also look at the estates where it comes from. For example, there are more than 9, wineries in Bordeaux, France, and the quality is naturally uneven. The famous wine estates are Lafeizhuang ChateauLafiteRothschild, Latuzhuang ChateauLatour, Magao Village ChateauMargaux, Mutong Village ChateauMoutonRothschild, Bertus Village Petrus, Aosong Village ChateauAusone, Baima Village ChateauChBlanc and so on.

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To see if red wine has the aging ability, more than 95% of red wine on the market does not have the aging ability. Those red wines that do not have the aging ability are not kept as long as possible. The best drinking period depends on their storage environment, selected grapes and brewing technology. However, some red wines have the ability of aging and can be stored for decades or even hundreds of years. The aging ability of red wine mainly depends on the strength of tannic acid contained in the wine and the type of grapes. For example, Cabernet Sauvignon is more suitable for making aged wine. There is a way to identify whether a wine can be aged, that is, buy more than a dozen bottles of the same wine, and open a bottle every six months to taste its taste. If its internal structure has not changed much in two or three years, it means that it can be put for more time.

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depending on the year of red wine, even if it is the same winery and brand, the red wine varies from year to year, depending on the rainfall, temperature, light, etc. in Bordeaux, for example, in 1995, the summer temperature was high and slightly dry, and the grapes grew well. In addition, the alternation of dry hot days and some humid weather in October provided good conditions for the growth of expensive rot, so the quality of red wine in this year was high.

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depending on the date of watching red wine, the shelf life of red wine is generally ten years, but it is best to drink it within five years, because red wine has a decline period, and the longer it is left, the worse it tastes (except for red wine with aging ability). It is best to drink it in its peak period, but it is not easy to grasp the peak period, and it depends on various analysis. Some red wines are marked with the year of red wine, such as 25 dry red wine, which means that it was produced in 25. No matter when you bought it, the shelf life should start from 25.

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Look at the label of red wine. The label will clearly indicate the address, factory name, shelf life, alcohol content, product type, raw materials and so on. Consumers should choose according to their own needs.

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depending on the types of red wine, there are several classification methods for red wine. I won't introduce them one by one here, but mainly introduce the classification methods according to the sugar content. Red wine is divided into dry wine, semi-dry wine, semi-sweet wine and sweet wine according to the sugar content. When the sugar content in the wine is less than 4 grams, it is dry wine, and the sweetness cannot be felt at the entrance, such as dry white wine and dry red wine. When the sugar content is 4-12g, it is semi-dry wine, which has a slightly sweet feeling at the entrance, such as semi-dry red wine, semi-dry white wine and semi-dry peach blossom wine. Semi-sweet wine, on the other hand, contains 12-5g of sugar, which is sweet in the mouth. The sugar content of sweet wine is more than 5 grams, and it has obvious sweetness at the entrance.

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