It's generally not recommended to store oil-based chutneys in metal containers, especially reactive metals like aluminum or copper, as the acidity of the chutney can react with the metal, potentially affecting the chutney's flavor and safety. Glass or food-grade plastic containers are better options.
Oil-based chutneys often contain acidic ingredients like vinegar, lemon juice, or tamarind. When these acidic components come into contact with certain metals, a chemical reaction can occur. This reaction can leach metallic ions into the chutney, altering its taste and potentially making it unsafe for consumption. Reactive metals like aluminum, copper, and iron are particularly prone to this type of reaction. While stainless steel is generally more resistant, prolonged contact with highly acidic foods can still cause some degradation over time. Glass containers are inert and won't react with the chutney's ingredients, preserving its flavor and quality. Food-grade plastic containers are also a suitable alternative, as they are designed to be non-reactive with food products. Always ensure the plastic is labeled as food-grade to avoid leaching of harmful chemicals.
Before storing your oil-based chutney, sterilize your glass jar by boiling it in water for 10 minutes. This helps to eliminate any bacteria or mold spores that could spoil the chutney and extend its shelf life.