How Do I Tell if a Button is Bakelite?

I see this question discussed frequently on various sites.  Here’s my method.

Bakelite has a distinctive smell when heated slightly. I usually rub the button on my hand until it feels a little warm and then sniff it. To learn what this smells like, take an item that you know for sure is bakelite, do the same with it and then compare the odors. This is the least intrusive method. Some folks swear by simethecone or formula 409, which when rubbed on the item with a q-tip take on a yellow/orange color. But this has the potential to damage the item. Others use a pin-prick test where you heat a pin and plunge it into the material. This definitely leaves a mark. The best resource on identifying button materials is “Button Materials A-Z: Identification Guide” by Jocelyn Howells.

What is your favorite method?