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Bronze grave markers and copper sulphate degradation

Please help. how do I remove copper sulphate ⇦ on eBay or Amazon [affil link] from a bronze cemetery plaque. Thank you.

Glenn Howard
vacation properties - Florida Keys - Key Largo, Florida, USA
2007

Try 5% ammonium citrate(mix 50 gm citric acid ⇦ on eBay or Amazon [affil link] and 1 lit water + add some ammonia,pH must be 9).If you want you can gel it with some cellulose based paper wall glue(or with agar-agar or gelatin, or even corn starch).Use it only on places with patina, rinse it well after 10-30 minutes,then repeat if needs-after treatment you can lacquer it(with Everbrite [a finishing.com supporting advertiser] or Incralac ⇦ on eBay or Amazon [affil link] ).Good luck!

Goran Budija
- Cerovski vrh Croatia
2007

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