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Caseinite A product for case hardening steel. Comes in a can in granular form. just cherry the item to be hardened and stick in a couple times should do the trick. Also known as case hardening. made a cold chisel in junior high metal shop. worked well for years. case hardening is surface only. not sure of depth but should work.for years.
can be found at McMaster - Carr or MSC I believe
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