Hey Guys..
Jarl..
First before we answer this you have to Define what you call "flint"
Are you talking about natural flint ot Ferrocerium ??
Sometimes the two are interchanged,, however with a question of this nature to give you an accurate answer, we have to know what you mean by "flint"
If it's Ferro, then Any sharp object scraped against ferro Should produce some amount of sparks,,depending on the object...
If you are talking about Natural flint...
Then it takes a certain steel and certain hardness of steel to produce sparks from natural flint...
ttyle
Eric
O/ST