Hi
I'm living in Ghana and saw some traditional priests demonstrate their 'powers'. I was interested in a handkerchief, apparently borrowed from the audience, which was held in the air and rubbed for a while until it caught fire. I'm not aware that things such as flash paper, etc can be purchased here so I'm wondering if anyone has ideas what they can be using to make it spontaneously combust?
Thanks

ps - maybe it really was supernatural!