All vermicelli are made of starch as the main raw material, and starch products, especially dry ones, are organic matter themselves and are easy to burn, and the products after combustion are also the same, so the combustion method is used Unreliable.

Mr. Su, a chemistry teacher at Xiamen No. 1 Middle School, also said that industrial formaldehyde is mixed into starchy foods and cannot be identified by simple methods. “Unless the content is particularly large, it will be irritating after heating. The smell, if the content is small, you can’t smell it.” Therefore, if you want to identify whether the vermicelli contains formaldehyde, it is best to send it to a professional institution for testing and confirm it through potions, reagents, etc.