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The latest (June 2010) KC Woodworkers Guild newsletter had an article about making your own tools and hardening the steel (page 2, cont. on page 4). It had an interesting fact I didn't know, but thought I'd share...
"The simple test for knowing that the workpiece has reached its proper temperature for hardening is the steel will loose its magnetic property. Keeping a small magnet (with a large handle) handy lets you test the steel. When the magnet no longer sticks, the steel is ready for the quench."
http://www.kcwoodworkersguild.org/Newsletter/newsletter.htm
"The simple test for knowing that the workpiece has reached its proper temperature for hardening is the steel will loose its magnetic property. Keeping a small magnet (with a large handle) handy lets you test the steel. When the magnet no longer sticks, the steel is ready for the quench."
http://www.kcwoodworkersguild.org/Newsletter/newsletter.htm