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With it you can achieve surprising hardness AND still retain decent toughness in mild steel.
I've read old references to "slippery brine", and I suspect this idea isn't actually NEW.
This mixture was invented by Rob Gunter.
It won't be glass-hard, but you should find that a file does not bite well, and it'll still be plenty tough. I like this stuff for corkscrews, hardy tools, short-term specialty chisels, RR Spike knives (If you're gonna do it, y'gotta at least try to make it a decent knife), short-term or low-use marking punches.
...and lots of cracks.