No, it is not safe to use copper vessels for cooking food in a microwave oven, including pressure cookers. Cooking food in copper containers can be harmful to health and poses several risks:
Electrical hazard: Copper is a highly conductive metal, and microwaving it can cause electrical arcing, sparking, or even fires inside the microwave. This can damage the microwave and create a potentially dangerous situation.
Uneven heating: Copper does not heat evenly in a microwave, which can lead to hotspots and cold spots in the food being cooked. This uneven heating can result in undercooked or overcooked portions of the food.
Leaching of copper: When copper comes into contact with acidic or alkaline foods, it can leach into the food. High levels of copper consumption can lead to copper toxicity, which can cause nausea, vomiting, abdominal pain, and even liver damage.
Microwave radiation: Microwaving metals, including copper, can lead to the production of microwaves that can be harmful to both the microwave itself and the surrounding environment.
To ensure food safety and protect your microwave from damage, it's important to use only microwave-safe containers and utensils when cooking in a microwave oven. Microwave-safe containers are usually labeled as such and are made of materials like glass, ceramic, or microwave-safe plastic.
If you prefer to use copper vessels for traditional stovetop cooking, make sure the vessel is lined with a non-reactive material like stainless steel or tin. Always follow the manufacturer's instructions and guidelines for safe and proper use.
In summary, avoid using copper vessels or any metal containers in a microwave oven to ensure food safety and prevent potential hazards. Stick to microwave-safe cookware and utensils for microwave cooking.