The Seim book on color hardening? Thoughts?

https://www.amazon.com/Colour-Case-Hardening-Firearms-Principles-Practices/dp/1775018008/ref=sr_1_1?crid=1DC5BHJOSTJFZ&keywords=color+case+hardening+of+firearms&qid=1585662475&sprefix=color+case+har%2Caps%2C307&sr=8-1#customerReviews


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