Use a magnet to separate them. Brass is not magnetic, so magnets
will not attract brass bolts. Iron, however, is magnetic, so iron
bolts can be picked up by using a magnet.
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Brass tacks are what you see when you take the upholstery off
furniture - the wood is traditionally held together by that kind of
fastener. "Getting down to brass tacks" means stripping away
anything not essential.
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Brass Tacks - 2004 was released on:
USA: 16 April 2004 (San Francisco Film Festival)
USA: 2013
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The cast of Romance and Brass Tacks - 1918 includes: Claire
Adams Harold Foshay Olin Howland