That's not incense. It is the ultraviolet rays of the sun that kill the mold, bacteria, poisons, other microorganisms, some invisible bugs and your body odor on the quilt, make the quilt clean, and produce the smell of cotton fiber swelling inside the quilt. The smell produced by the dried quilt is temporary, and it will disappear when you put it in the shade or use it for a long time. Generally speaking, it is the smell of cotton after being irradiated by ultraviolet rays.