Post Production Heat Treat?

I've taken those wiggly-dotty color-blindness tests and stumped the person giving it. To quote: "You're not supposed to be able to see that!" I am not one to mess with, when it comes to relative color values. You wanna get picky about matching drapes to carpet or your pants to your socks... don't even ask me. I'll drive you bonkers.

But that doesn't mean anything at all in the context of heating steel!
It's only fair to mention that my experience with judging color is not nearly as well-informed as Page's.
But I can tell you with absolute certainty that two or twenty well-trained humans with equal experience can argue all damn day about whether 2 cooked carrots, 2 hot chunks of steel, and/or 2 pieces of cloth are truly the same color. They will all be wrong, to one degree or another. (One might get lucky... but the odds are against it.)
 
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I'm with James about color.

Several years ago, I decided to buy a very expensive gemological tool called a colorimeter. It cost about what two fully loaded TW90 grinder costs. I ended up sending it back, as even this very fine instrument could not positively identify color right every time. If I had to go back and decide which reading is right by eye, I might as well not use the machine at all.
 
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