Tip: When making salsa with lime juice it’s recommended to use non-metal bowls (like glass, ceramic, or plastic) instead of metal bowls. Lime juice is highly acidic. If it comes into contact with certain metals, such as aluminum or copper, a chemical reaction can occur. This reaction can impart a metallic taste to the salsa, altering its flavor. Aluminum can oxidize when exposed to acid which may not only affect the taste but also dull the vibrant colors of the salsa, especially the bright reds of tomatoes.