It's generally not recommended to store tamarind in aluminum containers for extended periods due to the tamarind's acidity, which can react with the aluminum. Glass or food-grade plastic containers are better options.
Tamarind is a highly acidic fruit. When tamarind comes into contact with aluminum, the acid can cause a chemical reaction. This reaction can leach aluminum into the tamarind, potentially affecting its flavor and, more importantly, posing a health risk if consumed regularly. While a short contact time might not cause significant harm, prolonged storage in aluminum is best avoided. Instead, opt for containers made of materials that are non-reactive with acids, such as glass, stainless steel, or food-grade plastic. These materials will preserve the tamarind's quality and prevent any unwanted chemical interactions.
To extend the shelf life of tamarind pulp, store it in an airtight container in the refrigerator. You can also freeze tamarind pulp in small portions for even longer storage. This prevents spoilage and maintains its flavor.