Red Spot on gold Coin

[SilveradoUK]

Hey guys! After checking on my coins after a while, I have found that some got the red spots on them, is there any good way to remove it? Do you think that Town Talk Gold Sparkle would be good for this?

I would appreciate any feedback and help!

 

 Thanks 

[SilverDrum]

I don't know, but i know a man that could help! @GoldDiggerDave

[daca]

 

 

 

[SilveradoUK]

Oh wow, not sure if I want to do it on that Proof Libertad☹️☹️☹️ But thanks for the ideas. 

[terakris]

Send to Ncs and they will get rid of it.

[GoldDiggerDave]

Some times it’s a easy some times not, it’s a mixture of chemistry and voodoo. 
 

it’s possible to remove copper spots with extreme heat, or acid both carry a risk. 

 

[LawrenceChard]

34 minutes ago, GoldDiggerDave said:

Some times it’s a easy some times not, it’s a mixture of chemistry and voodoo. 
it’s possible to remove copper spots with extreme heat, or acid both carry a risk. 

 

Does this advice relate to coins or body parts, @GoldDiggerDave?

😎

[dikefalos]

6 hours ago, GoldDiggerDave said:

Some times it’s a easy some times not, it’s a mixture of chemistry and voodoo. 
 

it’s possible to remove copper spots with extreme heat, or acid both carry a risk. 

 

Heat worked very well on a couple of my Pandas. But had smaller spots, than the Libertad above. But i'm not sure, if spots are coming back after a while, sold them all after removal

 

[RDHC]

11 hours ago, dikefalos said:

Heat worked very well on a couple of my Pandas. But had smaller spots, than the Libertad above. But i'm not sure, if spots are coming back after a while, sold them all after removal

 

Very interesting - and brave of you. Thank you. What is that mega cigarette lighter thing?

[dikefalos]

26 minutes ago, RDHC said:

Very interesting - and brave of you. Thank you. What is that mega cigarette lighter thing?

It's just a storm lighter. 

https://www.amazon.co.uk/Storm-Lighter-Refillable-Burner-Flamer/dp/B01MYC8683

After i saw this Video, i used a similar one

 

[RDHC]

23 minutes ago, dikefalos said:

It's just a storm lighter. 

https://www.amazon.co.uk/Storm-Lighter-Refillable-Burner-Flamer/dp/B01MYC8683

After i saw this Video, i used a similar one

 

Many thanks for the information. 

Also, I would very tentatively guess, as a complete non-scientist, that heat removal of the red spots might be less effective long-term than the chemical removal, if that is what it is, achieved by the aluminium and sodium bicarbonate plus water method, so I can understand why you sold without waiting to find out. (About this comparison, I'd like to hear from those with more science than I possess, which must be  most people since I barely passed a combined 'O' level Physics with Chemistry some 61 years ago almost to the day.)

[DaKine]

OK, this was covered in stepwise form on cointalk just the other day and was discussed there previously with regard to gold coins. I have used this VERY successfully on Bahamas .585 (14k) gold, Anguilla .900 gold, USA .900 and .999 - all proofs, Singapore Singold .999 gold. No magic, no metal loss, no abrasions, no tricks, just basic chemistry.

Weimar White wrote a book that is quite inexpensive on Coin Chemistry that is still readily available. No mysteries.

[GoldDiggerDave]

Just removed these this afternoon.

 

 

 

 

[Arganto]

On 31/05/2022 at 17:20, SilveradoUK said:

Oh wow, not sure if I want to do it on that Proof Libertad☹️☹️☹️ But thanks for the ideas. 

The bicarb and foil method is pretty harmless if done carefully. Either stand the coin on edge or suspend in the water to avoid contact with the foil and any potential scratching. May need a few goes this way. Make sure the water is hot, it seems to increase the agitation of the reaction. When rinsing don't rub with anything, hold the coin firmly by the edges with nitrile gloves or similar and use as high a pressure of cold water as you're comfortable with. I've done this is with proof £1 silver coins which usually mark up as soon as you look at them without a capsule, no scratches were added as far as my eyes and a basic loupe could see. If you're going to grade the coin don't do this, let the grading company conserve it, but if it's just for your enjoyment + potential resale value it's worth a shot (in my opinion). 

I believe @Pete, @LawrenceChard and other notable members have written interesting and useful posts on this subject; the search function can often present a lot to wade through but it is very useful.

[MetalMandible]

Little torch lighter to it has always worked best for me.  Of course, that was regular bullion.. never tried it on a proof.