Squiggly lines indicate that your container is microwave safe. This symbol can vary a lot ... which range from 1 to 7, Tupperware has a handy chart. At the end of the day, not every plastic ...

If your Tupperware has a symbol with wavy lines or a microwave with wavy lines, you can use it in the microwave without fear. Most containers have the Tupperware symbol of three arrows forming a ...

A microwave-safe symbol usually features three wavy lines, which indicate heat. 3. Metal utensils and cookware To understand why it's not a good idea to put metal in a microwave, you need to have ...

Our home in India had just gotten a microwave but microwave-safe ... before social media made it a thing. The Tupperware party was as much a symbol of Americana as the Thanksgiving turkey.