Why red grapes are only used for making wine?

That's not quite right! While red grapes are most commonly used for making red wine, they're not the *only* grapes used. Here's a breakdown:

Red Grapes for Red Wine:

* Color: Red grapes contain pigments called anthocyanins, which give them their color and are extracted during the winemaking process.

* Flavor: Red grapes often have bold, earthy, and fruity flavors that contribute to the richness of red wines.

But, other grapes are used for winemaking, too:

* White Grapes for White Wine: White grapes like Chardonnay, Sauvignon Blanc, and Riesling are typically used for white wines. They have less anthocyanin and produce a light-colored juice.

* Red Grapes for White Wine: Interestingly, some red grapes like Pinot Noir are also used to make white wines! The juice is pressed immediately after harvest before the skins can impart color. This results in a pale pink or even white wine.

* Blends: Many wines, both red and white, are made from blends of different grapes. This adds complexity and nuance to the final product.

In summary: While red grapes are a key ingredient in red wine, they are not the only grapes used in winemaking. Winemaking is a complex process with a wide range of grapes and techniques that create a diverse array of wines.