About Vegan Wine
"The reason that all wines are not vegan or even vegetarian-friendly has to do with how the wine is clarified and a process called ‘fining’. All young wines are hazy and contain tiny molecules such as proteins, tartrates, tannins and phenolics. These are all natural, and in no way harmful. However, we wine-drinkers like our wines to be clear and bright.
Most wines, if left long enough, will self-stabilize and self-fine. However, traditionally producers have used a variety of aids called ‘fining agents’ to help the process along. Fining agents help precipitate out these haze-inducing molecules. Essentially, the fining agent acts like a magnet – attracting the molecules around it. They coagulate around the fining agent, creating fewer but larger particles, which can then be more easily removed.
Traditionally the most commonly used fining agents were casein (a milk protein), albumin (egg whites), gelatin (animal protein) and isinglass (fish bladder protein). These fining agents are known as processing aids. They are not additives to the wine, as they are precipitated out along with the haze molecules."