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<p>[QUOTE=&quot;EWC3, post: 3194608, member: 93416&quot;]I see you know more chemistry then me, (but still, maybe less about coin cleaning?)&nbsp; EDTA became very popular specifically for treating Bronze disease, and I have some somewhere, but I heard it might be a carcinogen, so I never much used it.</p><p><br /></p><p>I am pretty hesitant about giving advice on web groups about coin cleaning, as who know who will read it - and maybe not be careful about what they get up to?</p><p><br /></p><p>Looks to me like the top drachm has already been incompetently cleaned, and left with specks of blue/purple/blackish silver chloride?&nbsp; Easy to remove - if so - by softening with Goddards silver dip and then soaking for just 15 or 30 minutes in ammonium thiosulphate.&nbsp; I think that is safeish to use (???) but.........caveat emptor</p><p><br /></p><p>I got my grounding in coin cleaning from a guy who worked in the BM lab long ago. </p><p><br /></p><p>But I heard he ended in hospital with kidney damage from the stuff he did.....</p><p><br /></p><p>Rob T</p><p><br /></p><p>PS I would leave the Syracuse tet alone.&nbsp; That sort of silver chloride will very likely leave a big corrosion hole if you take it off.&nbsp; But the drachm at the start might well be OK.&nbsp; Just guessing.[/QUOTE]</p><p><br /></p>

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