Ever put some acetone on a synthetic one? -Or lay a piece of sculpey on it?
At work, yes 🙂 We discovered that they completely disappear when acetone hits them (the first time was accidental, after that…not so much)
Never tried the sculpey though.
…I actually really hate packing peanuts in any way shape or form. The synthetic ones especially, but just…ack, I don’t like them.