>>2458855You quickly scrape the green thing over the black metal part, once the outer layer has been scraped away, you get sparks, like a BIC lighter.
If you scrape some shavings into a firenest, made from dry, roughed up grass or something, and throw a spark into it, you can start a fire.
You might want to use a longer piece of string between the scraper and your ferro rod. Or maybe use the back of your pocket knife instead of the scraper in the first place.
