Ferocerium devices are interesting, however they relate to instant flame fire making. Instant flame technology has been with us for a couple of centuries now since the invention of the match around 1800. What I teach is a bit more basic. Coal to flame methods used sucessfully for millenium prior of 1800, such as taking a mullein stalk and a split branch and making a coal in about 20 seconds. Also the fire piston. A wooden device that creates a coal by the heat of compression. Its nearly effortless and really quite amazing.
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