The sparks from your FLINT + STEEL need something to catch on to become an ember .
A SMALL LOSE WAD OF CHARCLOTH IS ALSO THE BEST THING LOADED INTO THE RECESS ON THE END OF A FIRSTICK PLUNGER
This ember is usually clean cotton cloth charred without oxygen like charcoal to become charcloth.
The clean burned out tin is pierced with a small hole and around 20 pieces of cotton loosely packed inside.
The lid is fitted and tin loaded onto low embers of fire for as long as smoke comes out of the hole (5-15 mins approx)
Pointed stick is inserted into hole as tin is removed from embers to stop air entering tin.
It will be hot, careful not to touch with fingers or hands use gloves and or tongs.
When cool, charcloth is removed and kept in airtight/watertight container for storage.
When struck by sparks or heated by compressed air in firestick, charcloth will smoulder until placed in a ball of tinder (fluffed up jute string is good) and blown upwards on to ignite tinderinto a little ball of flame.
Don`t blow downards as the tinder will burn you when it ignites.