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<p>[QUOTE=&quot;springfld.arsenal, post: 100676, member: 54&quot;]The antique ones as AF mentioned were bronze, but the reason was durability, bronze is harder than brass.&nbsp; A brass mortar would wear inside with use, and also give up tiny amounts of the metal which would mix with the stuff being ground.&nbsp; Sometimes you can tell bronze from brass in a bell-like shape by ringing it.&nbsp; Bronze will give a clear tone and ring for a relatively long time compared to brass which has a kind of dull, short duration ring tone.&nbsp; Scrap dealers can tell brass from bronze using spark or xrf analyzers.[/QUOTE]</p><p><br /></p>

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