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My favorite is oil on the blade. Beginners often squawk that their brand new razor does not pop hairs without having any clue what the HHT actually tells them or what it means. A perfectly sharp...

And conversely, especially but not exclusively for beginners, a failed HHT does not necessarily mean that a razor will not shave.

If I saw that differential appearance of the edge relative to the rest of the bevel with my microscope, I would assume a poor shave if the razor had just come off the hones.

However, if it was...

I don't understand this. Are you suggesting that this is layered steel?