metal vessels provide a clean surface for fermenting vegetables, fruits and wines. Stainless steel is the best choice for a metal container. Enamel over steel is a good choice if the enamel has no chips on the interior surfaces. Chipped areas may rust, which isn’t good for your vegetable matter .
Be careful to avoid metals like cast-iron, copper, aluminum, and tin, all of which can react with the acids in fermented vegetable material and give it a strange flavor or cause a color change. These metals can also leach into the food.