Red wine gets its color from pigments in grape skins, not from the juice itself. The juice inside nearly all red grapes is clear or slightly green. The deep reds, purples, and violets you see in a glass of wine come from a group of pigments called anthocyanins, which sit in the skin cells of dark-skinned grapes and leach into the juice during winemaking.
Anthocyanins: The Pigments Behind the Color
Anthocyanins are plant pigments found throughout nature, responsible for the color of blueberries, cherries, eggplant skin, and autumn leaves. In grapes, five main types of anthocyanins contribute to color, with one called malvidin being the most dominant in most red grape varieties. These pigments are produced inside grape skin cells and then stored in small compartments called vacuoles, where they accumulate as the grapes ripen.
The exact shade of a red wine depends on which anthocyanins are present and in what proportions. Some lean toward blue-violet tones, others toward orange-red. This is why a young Cabernet Sauvignon can look nearly opaque and purple while a Pinot Noir might appear translucent ruby. Grape varieties differ significantly in how much pigment their skins contain. Malbec and Cabernet Sauvignon pack some of the highest anthocyanin levels, while Pinot Noir sits at the lower end, which is why wines from that grape tend to be lighter in color.
How Color Gets Into the Wine
Since the juice starts out clear, the winemaking process has to pull color out of the skins. This happens through a step called maceration: after the grapes are crushed, the skins are left soaking in the juice, sometimes for just a few days, sometimes for two months or longer. Fermentation helps the process along because the alcohol produced acts as a solvent, drawing anthocyanins and other compounds out of the skin cells more efficiently than juice alone would.
Winemakers control the depth of color partly by deciding how long the skins stay in contact with the liquid. A short maceration produces lighter, more fruit-forward reds. Extended maceration, which can run 21 to 60 days or more after fermentation finishes, deepens the color and also extracts more tannins from the skins and seeds, giving the wine a firmer structure. Temperature matters too. Warmer temperatures speed up extraction, which is why some winemakers heat the crushed grapes briefly before fermentation begins.
Why the Color Changes as Wine Ages
If you’ve ever compared a young red wine to one that’s been in the bottle for a decade, you’ve noticed the color shifts from vibrant purple-red toward brick orange and eventually brown. This isn’t just fading. It’s a series of chemical transformations happening inside the bottle.
Free anthocyanins, the ones directly extracted from grape skins, are actually unstable on their own. Over time, they bind with tannins and other molecules to form larger, more complex pigments. Some of these new compounds are more stable than the originals, which is why well-made wines can hold their color for years. But others break down, precipitate out as sediment (that gritty residue at the bottom of an old bottle), or shift in hue. The net effect is a gradual move from youthful purple toward garnet and tawny tones. Oxygen exposure, even the tiny amount that seeps through a cork, accelerates these reactions.
You Can Make White Wine From Red Grapes
The fact that red color lives in the skin, not the juice, opens up an interesting possibility: if you press red grapes quickly and separate the juice from the skins before much pigment transfers, you get a white or very pale wine. This technique produces what’s called blanc de noirs, literally “white from blacks.” Champagne houses have used it for decades, pressing Pinot Noir and Pinot Meunier grapes gently to get clear juice for sparkling wine. The process requires careful handling at every stage to minimize skin contact, avoid oxidation, and prevent even trace amounts of pink color from developing.
Rosé works on the same principle, just with slightly more skin contact. A few hours to a couple of days with the skins gives you the salmon or pale pink color typical of rosé, compared to the days or weeks needed for a full red.
The Rare Grapes With Red Flesh
Almost all wine grapes, red and white alike, have clear or greenish pulp. But a small group of varieties known as teinturier grapes (from the French word for “dyer”) break the rule. These grapes produce anthocyanins in their flesh as well as their skins, giving them red juice straight from the press. Varieties like Alicante Bouschet, Rubired, and Dakapo fall into this category. The trait is genetically dominant and linked to extra copies of a specific DNA sequence that ramps up pigment production throughout the berry.
Teinturier grapes are sometimes blended into wines made from conventional red varieties specifically to boost color intensity. They’re relatively uncommon as standalone wines, but they play a practical role in regions where winemakers want deeper color without longer maceration times.