Acetum

Vinegar, popularly known as acetum during the Italian Renaissance, is a liquid consisting about 5-20%, water, and other trace chemicals. In Italy, vinegar is traditionally produced with grape and cork in the form of balsamic vinegar, which is very dark in color.

Aside from its common culinary use, vinegar can also be applied to copper plates to manufacture verdigris. This was a principal means of acquiring green pigment by Italian artists during the Renaissance.

Trivia

 * Acetum was a crafting ingredient in Assassin's Creed: Project Legacy, where six vials of acetum could be produced by combining two batches of grapes and one set of cork logs.