How to determine if heat treat worked and truly hardened?

thanks Skillgannon, will advise
re:
newjerseysteelbaron.com/ I didn't see any location address, hours of operation or anything of that sort on that site, send me a link for that info, would love to patronize his business in person
 
Actually, the skate test seems to work, a file slides over a heat treated blade, it feels like trying to file a file,

on an un-heat-treated piece of metal, the file catches on and easily removes material.
 
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