Looks like "hot spots" where your heating is not even before quench. Using a coal forge? Easy to get air blast hot spots if you are not careful. Making a tunnel -oven with black iron pipe can be very helpful in regulating an even heat.
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Carl Rechsteiner, Bladesmith
Georgia Custom Knifemakers Guild, Charter Member
Knifemakers Guild, voting member
Registered Master Artist - GA Council for the Arts
C Rex Custom Knives
Blade Show Table 6-H
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