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I want to remove a hardened steel bolt in a block of zinc (there is a through-hole, so I have two sides to work with). I have done this previously with aluminum and steel before, using a solution of alum to loosen the steel bolt.

Will I have as smooth a time using the alum method in the present case, or will the alum react with the zinc?

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    $\begingroup$ Related - but not duplicate - post here. $\endgroup$ – Todd Minehardt Jan 14 '18 at 22:28

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