oh Lisa, that's disgusting. I hadn't heard that one. My DH bought me a coat with a faux fur on the lining. the first thing I did was pull a few hairs out and burn them (they melted! ) because if it was real hair I wasn't going to want to wear it (Because it looked like dog)
so hair burns and stinks badly,
polyesters kind of melt and burn and have a very different smell.

I do that with yarn too. What's confusing is mixes of wool and acrylic. burns, stinks, melts?