There is a process used in wine making in which bits of protein are added to attract any sediment and help it drop to the bottom of the barrel. Things such as egg white albumen and fish protein are sometimes used for this. There are plenty of vineyards that do NOT engage in that process, but they also don't declare themselves vegan, even if they are.
I recently learned of some great vegan wines at Trader Joes, thanks to one of my Trendy Vegan followers, Dona Pop. These are sold at very affordable prices as well!
The name of one wine is "Terrenal" and it is imported from Spain. Dona tasted the Cabernet and Tempranillo and loved both the taste and the price. Apparently a Chardonnay is up next! She also recommends Sara Bee Moscato (also in Trader Joes) and
Deccolio Prosecco and Deccolio Moscato (which she found at Whole Foods Market.) Thanks Dona!If you want to do some research before you buy your next bottle, check out vegans.frommars.org/wine/ ~ I found it very helpful.