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A handy qualitative test for how much carbon is in a bit of steel is the grinder spark test. The sparks from grinding mild steel are visually different from the sparks given off by tool steel. There are heaps of videos demonstrating this. Here' is just one:It's easier to just get known samples of steel, though, and just do the test yourself since video can't really capture all the detail you can easily see for yourself. !שלום, חבר