Can aluminum foil lunch boxes be placed directly in the microwave?

Now that the weather is very hot, some food will easily become cold when stored, let alone winter, and we all know that aluminum foil lunch boxes have the function of heat preservation, so can it be heated directly in the microwave oven?
Try not to put the aluminum foil lunch box directly in the microwave.
Metal and enamel products cannot be used in the utensils used in the cooking situation of microwave ovens, because metals reflect microwaves. It not only reduces the heating efficiency of the microwave oven, and the heating uniformity is poor, but also makes the microwave contact with the metal to generate sparks, which is dangerous, and even damages the magnetron in severe cases.
Microwave ovens are usually insulated with aluminum foil lunch boxes. For example, put a glass of water and an ice cube wrapped in an aluminum foil lunch box in the microwave oven, and then the water boils, but the ice cubes hardly melt.
The aluminum foil lunch box can reflect microwaves. If cooking food that takes a long time, use a small amount of aluminum foil lunch box to wrap the easy-to-cook food. After cooking for a while, remove the aluminum foil lunch box and continue cooking. Cook food more evenly.
However, when using, the glossy part should be close to the food to reduce the reflected energy. This is possible when using the grill function because no microwave components are used.
The aluminum foil lunch box mainly has the function of heat preservation, which can make the food softer and more delicious. Don't use the wrong method!