How to tell if wine is bad?

Method 1: Identify the appearance of wine.

Due to the extensive application of advanced technology, most wineries have disinfected, clarified and stabilized the wine, so most of the wine on the market is clear and bright. However, if fish, bacteria or yeast get out of the net and are inadvertently contaminated, and serious situations such as metal pollution or protein instability occur, problems will occur in the brewing process and liquor will be turbid.

Sometimes when you open the wine, you see granular crystals sticking to the wine stopper, or when you pour the wine, you find some crystal cubes at the bottom of the glass. Don't worry too much. This is normal, which only reflects the high content of potassium or calcium in wine. Red wine also has the opportunity to crystallize, but these crystals will stick to phenolic resin and become phenolic polymers, that is, wine dregs; Wine dregs are especially common in wines that have been aged for a long time. In fact, these wine dregs are not harmful to human body, but they are not clear and perfect. Changing the bottle will solve the problem.

It makes sense that sparkling wine has obvious bubbles, but if a bottle of sparkling wine (red and white wine without bubbles) has many bubbles, it may be that the winery accidentally let yeast invade the bottle, causing the wine to ferment again and the taste of the wine will deteriorate, so we can conclude that it is bad wine. It should be noted that individual liquors deliberately retain a small amount of carbon dioxide, hoping that the taste of liquor will be fresher. It is normal that there are a few bubbles at the bottom of these white glasses.

Color is a big hint to judge whether wine is healthy or not. If the factory time of wine is only ten or eight years, red wine is amber or orange, and white wine is too golden with brown, this may mean that wine may be accidentally oxidized (not suitable for intentionally oxidized wine).

Method 2: Identify the smell of wine.

An ordinary glass of wine should have a pleasant aroma. Generally, young wines have obvious fruity or floral flavor. If they leave the factory for a long time, the smell will change from fresh fragrance to more mature and deeper fruit fragrance, such as dried fruits and dried flowers. Some grapes produce unique and interesting non-fruit flavors, such as soil, leather, truffles, coffee, caramel and nuts. But please note that Spanish Fino Sherry is fortified wine, and its smell is not dry white wine. Fino has a unique style, full of special flavors such as olives, salted nuts, shrimp slices and dried pears.