Since acrylic is plastic, it melts with heat.
If you can pull a few loose fibers from the blanket, you could try applying heat and see if it melts like plastic.
Use tweezers to hold the fibers, to protect your fingers from the heat source.
Avoid open flame.
Sources of heat for testing:
Clothes iron on high, no water
Curling iron or flat iron for hair
Maybe I've just been watching to much TV (Bones, series) and am starting to think like Hodgins.