![](http://www.alamy.com/thumbs/6/15B6C103-D56D-41A6-B335-258B29BEC484/2PR618F.jpg)
Glimmering heat from glowing charcoal to harden knives
A lot of heat is required to harden knives.
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Photo credit: © terra / Alamy / Afripics
License: Royalty Free
Model Released: No
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