Heat-harden Brass?

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I am wondering if brass can be heat-hardened. I've made a brass cuff that is a bit too flimsy, and would like to harden it without changing the surface. I've already tried tumbling with steel shot for about 5 hours, but it did not seem to harden it at all. Any suggestions/ideas? I've searched the web and ganoksin, and the answer seems to elude me.

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