The bleached one may contain toxic dioxin and which can leach when heated. It can be harmful to your health and cause many health problems. So, it’s better to use unbleached parchment paper. The next toxic thing it can contain is Quilon.
Furthermore, is parchment paper supposed to burn?
Parchment paper may be heat resistant, but it is not flame retardant! … Parchment will not only burn, it will burn big. 3. You should NOT use parchment paper under a broiler or in a toaster oven.