Wine is a subtle beverage, and when it is improperly stored or contaminated, its flavor and quality may be significantly compromised. For those who wish to delve deeply into the world of wine tasting, discerning whether a red wine has gone bad is one of the fundamental skills. The following details how to judge whether red wine has spoiled from three aspects: visual, olfactory, and gustatory, as well as how to avoid these issues.

1. Visual Inspection: Observe color and condition

Color Changes:

Red Wine: A normal red wine should display a vibrant purple-red or garnet color. If the color becomes dull, with brown or brick-red hues, it may be a sign of oxidation or excessive aging.

White Wine: White wine tends to turn a deep yellow or brown over time, which is usually a sign of oxidation.

Clarity:

Healthy wine should be clear and bright. If it appears cloudy, has excessive sediment, or contains unusual impurities, it may indicate microbial contamination or secondary fermentation.

Sparkling Wine:

If a non-sparkling red wine has fine bubbles, it may indicate secondary fermentation in the bottle, often due to improper storage.

Cork Condition:

If the cork is protruding or loose, it may be due to the expansion of the wine from heat, allowing oxygen to enter the bottle and hastening spoilage.

2. Olfactory Inspection: Identify abnormal odors

Oxidized Odor:

Bad wine often emits odors resembling vinegar, caramelized apples, or nuts. This is because sugars and alcohol convert to acetic acid after excessive oxygen exposure.

Cork Taint:

Due to TCA (2,4,6-trichloroanisole) contamination in the cork, the wine may smell like wet cardboard, mold, or a damp basement.

Sulfur Odors:

If you detect odors of rotten eggs, burnt rubber, or matches, it may be caused by excessive sulfur compounds (such as hydrogen sulfide).

Other Off-Odors:

If you smell rotten fruit, wet dog hair, or unpleasant farm odors (Brettanomyces contamination), it indicates the wine has been contaminated.

3. Gustatory Inspection: Confirm taste abnormalities

Acidity:

Bad red wine typically has a sharp acidity, similar to vinegar, and may cause a stinging sensation in the nostrils.

Abnormal Sweetness:

If a non-sweet red wine (such as Cabernet Sauvignon) tastes overly sweet, it may be due to sugar conversion after being heated.

Flat Taste:

A wine that has lost its fruit aroma and complexity, tasting flat or even bitter, is the result of oxidation or excessive aging.

Secondary Fermentation Taste:

If a non-sparkling wine has a slight effervescence and a tart, tingling sensation, it may have undergone secondary fermentation.

Wine tasting is an art and a science. Whether you’re a beginner just starting out or an enthusiast looking to enhance your tasting skills, mastering the proper techniques can help you gain a deeper understanding of the unique flavors of each bottle of wine. So, wine tasting is not a mystical endeavor but a sensory exploration that can bring you endless enjoyment.

Wine Tasting Techniques: 4 Steps to Transform You into a Wine Expert

1. Observation (Look)

The first step of wine tasting is to use your eyes to appreciate the color and condition of the wine. This is not just a visual pleasure; it also provides important clues about the wine’s age, region, variety, and winemaking methods.

1. Color and Clarity:

Tilt the glass at a 45-degree angle and observe the wine's color against a white background. The color of red wine changes with aging, evolving from deep purple or crimson when young to pomegranate red or brick red, eventually showing brown. White wine, on the other hand, appears pale yellow or straw-colored when young, becoming gold or amber as it ages.

By observing the depth and hue of the color, you can infer the body and richness of the wine. Generally, a deeper color indicates a fuller body. Additionally, pay attention to the wine's clarity. Clear, transparent wine signifies good winemaking practices and storage conditions, while cloudy wine may indicate flaws.

2. Viscosity (Wine Legs):

Gently swirl the glass, observing the "wine legs" or “wine tears” that form on the inside of the glass. This is due to the surface tension caused by the evaporation of alcohol. In a controlled environment, it has been found that the thickness and flow rate of the legs can reflect the wine's alcohol content, glycerin level, and extract content. The thicker the legs and the slower they flow, the higher the alcohol content and the fuller the body.

3. The Glass and Lighting:

Choosing the right glass is crucial. A standard tasting glass has a larger bowl and a slightly tapered rim, which helps concentrate the aromas. Lighting is also important; natural light is the best choice for accurately observing the wine's color and clarity. Avoid tasting wine in dim or colored lighting.

2. Smelling (Smell)

Smell is one of the most important senses in the tasting process. The aromas of wine are complex and varied, showcasing the unique charms of grape varieties, regional terroir, and winemaking processes.

1. Smelling Tips:

Bring the glass close to your nose and take a gentle, short sniff to grasp the overall aroma of the wine. Then, take a deep breath to fill your nasal cavity with the aroma and appreciate the different layers of scent.

2. Aroma Identification Techniques:

When smelling, pay attention to the fruit aromas and look for other layers of scent, such as herbal notes, spices, or earthy qualities. These layers can reveal the complexity and origin of the wine. For example, some red wines like Pinot Noir often exhibit aromas of red fruits, while deeper-colored Syrah may showcase notes of blackberry and blueberry:

• Fruit Aromas: Red fruits (strawberries, raspberries, cherries), black fruits (blackberries, blackcurrants, plums), citrus fruits (lemons, grapefruits, oranges), tropical fruits (pineapples, mangoes, passion fruits), etc.

• Floral Aromas: Roses, violets, jasmine, honeysuckle, etc.

• Herbal/Spicy Aromas: Mint, eucalyptus, rosemary, thyme, cinnamon, cloves, black pepper, etc.

• Oaky Aromas: Vanilla, toasted bread, smoke, coconut, coffee, caramel, etc. These aromas usually come from oak barrel aging.

• Earthy Aromas: Flint, limestone, wet slate, chalk, mushrooms, soil, etc. These aromas reflect the soil characteristics of the vineyard.

Try to use precise vocabulary to describe the aromas you detect, such as “ripe black berry aromas” or “subtle violet floral notes,” instead of simply saying “fruit aroma” or “floral aroma.”

Learning to taste wine is an art that combines sensory enjoyment with rational thought. Tasting is the highlight of the wine tasting process; through tasting, a rich sensory experience is about to unfold before you. You can gain a deeper understanding of the wine's personality, feel its structure, balance, and complexity, allowing your taste buds to fully appreciate the various flavors of the wine.

Tasting Techniques

Before you start tasting, first take a small sip of the wine, allowing the liquid to flow fully in your mouth, covering every part, and then swallow or spit it out. You can then gently inhale and exhale through your nose. This activates our senses, releasing more aromas and enhancing the perception of flavors.