Small Localized Verdigris Spot Removal Using 3% Heated Hydrogen Peroxide Solution 1 1

[Mike Meenderink]

Heat some hydrogen peroxide (3% solution) in the microwave (hot but not boiling) and soak the coins in for 2-4 hours or until they look clean, and then soak them in a bath with just enough hot water to cover the coins, with baking soda to neutralize the peroxide, let sit for 30mins. Now this method WILL strip the patina away and leave the coins in a semi BRIGHT chemically environmentally vulnerable condition, but the verdigris and or bronze disease will be removed, then if you want to seal the coin as is use a bit (1 drop on finger gently dab, do not rub on coin both sides then dab excess away with a soft clean cloth) of mineral oil on the coin. You can also re patina it with Jax brown blackener or JSP copper coin duller instead and then seal with renaissance wax to get a more authentic color and return the coin to a more natural look while providing environmental protection. Left photo is conserved coin with Jax and sealer wax. Right photo shows original spots on coin in original condition. Not a valuable coin but a good candidate for conservation and practice. Results are decent and leave no trace. Cheers!

 

Edited Friday at 06:25 AM by Mike Meenderink

[Henri Charriere]

On 8/23/2024 at 11:07 AM, Mike Meenderink said:

Heat some hydrogen peroxide (3% solution) in the microwave (hot but not boiling) and soak the coins in for 2-4 hours or until they look clean, and then soak them in a bath with just enough hot water to cover the coins, with baking soda to neutralize the peroxide, let sit for 30mins. Now this method WILL strip the patina away and leave the coins in BRIGHT copper condition, but the verdigris and or bronze disease will be removed, then if you want you can re patina it with Jax brown blackener then seal with renaissance wax. Left photo is conserved coin with Jax and sealer wax. Right photo shows original spot on coin in original condition. Not a valuable coin but a good candidate for conservation and practice. Results are decent and leave no trace. Cheers!

 

I would like to know what the NGC conservation experts have to say about this.

[Mike Meenderink]

When a decent details coin (IHC) like this has good results, it usually replaces a coin (IHC) of lesser quality, eye appeal or lesser details in my Whitman album sets. This coin was purposely purchased for $8 in an attempt to better my existing 1899 F 15 BN IHC. The conserved 1899 IHC now cured looks much better and grades AU 53 BN. A pretty big upgrade for the slot and a great value in the end. Winning!

Edited August 29 by Mike Meenderink