But you may be surprised to know that the color of a properly aged wine is not at all bold. The tannin, which comes from the grape skins, is what give wine its color. The color changes from an intense ruby red to more of an orange-like color with hints of brick red. Why does this happen? This is usually due to the oxidation of wine over time. Even if the bottles are sealed tight, there is always a minimal amount of oxidation on tannins.