Tempering a blade multiple times

[Bud]

This all raises a lot of questions for me. Not earth shattering questions but curiosity questions. Say a blade is tempered at 450 degees and turns out to be Rockwell 58. So if it's tempered again at 350 degrees will it be Rockwell 60 or at least harder than it was before? How about if you go the other direction? I know that all these steels have different temperature reactions but hopefully you get my drift.