@eGJ - you’re the expert on Frankenwein . Is it is fact vegan?
I have recently read the following
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