To test if a dish is microwave safe, you can put it in the microwave with a cup of water. Find a glass or cup that is microwave safe, and fill it three-quarters of the way with water.  It’s important to use a cup that you know to be safe for the microwave, otherwise the test may not work. To be certain, find a cup that has the microwave safe stamp on the bottom. Place both the glass of water and the dish in question side by side in the microwave. Microwave the two items together on high power for one minute.  If the dish is too large to sit side by side with the cup, place the cup on top of (or inside) the dish. To increase the power on your microwave to high, look for a button that says Power, Menu, or Settings. After a minute in the microwave, use oven mitts or a potholder to remove the cup of water. Then, place your hand on the dish in question to feel how warm it is:  The dish is unsafe for the microwave if the dish is warm and the water is cold. A warm dish means it absorbs heat. The dish is safe for the microwave if the dish is cool and the water is warm. A cool dish means it doesn’t absorb heat. Note that the dish may feel warm in the center if you had the cup of water in or on the dish. In order to keep track of which dishes are microwave safe and which aren't, use a permanent marker to label the bottom of the dish with the results of your test.  You can use any labeling method you like for your dishes. For instance, you can mark microwave-safe dishes with a happy face, the letter M, or two wavy lines. Don’t forget to label dishes that aren't safe for the microwave as well. You can use an unhappy face, an M with a line through it, or some other indication.
املئي كوبًا بالماء. سخني الطبق في الميكروويف مع كوب المياه. أجري اختبار لمس. صنفي الطبق.