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Not saying you are wrong, I spent all of five minutes google'n this, but what I came up with is the opposite of what you are saying. I have always heard it as "flint and steel" and all the "bushcraft" flint strikers I see are made of high carbon steel, not pure iron. Tiny globs of burning Iron is supposedly what's igniting the tinder. But pure iron is too malleable to chip off so they use hardened steel.
That's where my question comes from... Even though sufficiently "hard", Is the INFI alloy too "tough" to throw sparks when struck with a hard rock such as flint, chert, quarts, etc.