Metal can indeed interfere with fermentation, especially when it comes to acidic ferments. The more acidic your ferment becomes, the higher the likelihood that metals will corrode and leach into your ferment. This can be quite dangerous, as it not only affects the taste and color of your ferment, but also poses potential health risks.
One of the main concerns with using metal vessels for fermentation is the possibility of metal corrosion. When acidic foods or liquids come into contact with certain metals, such as aluminum or copper, a chemical reaction can occur, causing the metal to break down and release ions into the ferment. These ions can then contaminate the ferment and alter its taste and quality.
Additionally, some metals, such as lead or cadmium, can be toxic and pose serious health risks if consumed in high amounts. While the amount of metal leaching may vary depending on factors such as the acidity of the ferment and the type of metal used, it is generally recommended to avoid using metal containers for fermentation to ensure food safety.
Glass and stainless steel, on the other hand, are considered safe materials for fermentation. Glass is non-reactive and does not leach any substances into the ferment, making it an ideal choice for preserving the flavors and quality of the ferment. Stainless steel is also a good option, as it is non-reactive and does not corrode easily. However, it is important to ensure that the stainless steel used is food-grade and does not contain any coatings or additives that could potentially contaminate the ferment.
In my personal experience as a brewer and sommelier, I have always preferred using glass or stainless steel vessels for fermentation. I have witnessed instances where using metal containers resulted in off-flavors and discoloration of the ferment. This not only affected the taste and appearance of the final product but also raised concerns about the safety of consuming the ferment.
To avoid any potential interference from metal during fermentation, it is best to stick with glass or stainless steel vessels. These materials provide a safe and reliable environment for the fermentation process, ensuring that the flavors and quality of your ferment are preserved without any unwanted metal contamination.