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<p>[QUOTE=&quot;Conder101, post: 3751841, member: 66&quot;]The part about the softer die being more likely to receive the clash marks.&nbsp; As to why one die would softer than the other, it is the real world and not two items are truly identical so given the same heat treating no two dies will be exactly the same hardness.&nbsp; Plus the dies are heat treated in groups and they may be some difference depending on where the die was located in the group (center, edge, front of the furnace, in the back).&nbsp; Then the quenching isn&#039;t going to be exactly the same for each die either.&nbsp; Some will have cooled more than others before quenching, if the quench in a tank, the contents of the quenching tank will be colder for the first die than the 50th etc.</p><p><br /></p><p>As to why the reverse is the softer one, will I can&#039;t really say if that is true, but if it is it may be because the reverse dies are typically shallower in relief, and since the deeper obverse will have more metal&nbsp; movement/filling, they may take more care in their hardening.[/QUOTE]</p><p><br /></p>

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