Microwave Ovens. Do not use plastic trays or containers that are not made specifically for microwaves. They may release toxic chemicals like benzene into the food. If you're unsure whether a glass container is safe for use, microwave the empty container for one minute. Then touch it. If it's warm, it's unsafe for the microwave. If it's lukewarm, it's safe for re-heating. If it's cool, it's safe for cooking.

An important reminder: Never put any steel or silverware utensil inside the microwave, as this will cause your microwave oven to explode.