How to safely remove ink from gold coin?

Agree. Chloroform (CHCl3) smells sweet. So does its cousin, iodoform (CHI3). Both were used for decades medically before the former was declared too toxic, mostly liver toxicity and possible carcinogen. I suspect that part of the toxicity attributed to chloroform was due to contamination with its much more toxic relative, carbon tetrachloride (CCl4). However, banning its medical use was justified. Iodoform is still sometimes used as a disinfectant or antiseptic.

I remember that into the 70's, chloroform was still incorporated into cough drops and syrups and was quite effective. Then it was banned.

Cal

 

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Yeah, the amount of chloroform that will put you into anesticized sleep is close to the amount that will kill you. I think carbon tet is toxic because of its own set of properties. But it DOES smell good...like Juicy Fruit gum.

 

I'm more of an ether man myself.

 

Not bad, but the worst hangover I EVER had.

 

Frankly, I don’t care for ether.

 

I would send it to NGC/NCS to see if it can be conserved. Leave it to the pros to handle this. I've submitted a few coins to NCS with favorable results.

 

I’ll take a Nitrous Oxide, neat, please.
and for serious things, milk of amnesia.

I always enjoy when you guys start tawkin science.

 

TheMiz, posted: "I would send it to NGC/NCS to see if it can be conserved. Leave it to the pros to handle this. I've submitted a few coins to NCS with favorable results."

OP, I disagree 100% with this. Please read my two earlier posts. This will be the typical result...Butt ugly.

The other image shows two of the commonly seen discolorations on gold. The tiny black spec is a piece of debris struck into the coin. The larger copper colored spot is oxidized copper at the surface. It will dip off and should leave very little trace or discoloration.

 

Okay, I'll now offer my way to remove that mark - really sharp dental tools or a Dremel grinding wheel.

 

If acetone didn't work- leave it alone. It will cost you more to have it conserved than the increase in value it will get.

 

The only sure fire way to do get rid of those marks is to make up a batch of Aqua Regia... But I guarantee you will not like the results!

Disclaimer: PLEASE DO NOT DO THIS - it's humor! (and it will disolve the coin!)

 

Hello. I enlarged your images and it appears that the coin was buffed or something similar to remove some marks. It also appears that the ink may be from a Permanent marker. That type of perm marking ink is difficult to remove and based on my observation of the buffing in that area, I would not suggest sending it in for grading. From the images, I would say it is authentic so not a problem. Just doesn't seem worth spending money for a details grade and authentication.

 

Looks like a mark made by the rubber wheel in a counter.

Extremely difficult to remove if so.

 

A friend of mine had an AA machine that operated on Nitrous or Oxygen and when I would be in his lab waiting for him to finish, I would uncouple the hose from the nitrous and have a few hits...nothing much, but fun.

 

@Kentucky, I'm always happy when my dentist says I need a good cleaning and asks whether I would like some gas. Why, yes! Thank you very much! My dentist happens to be a comedian, so between that and the Nitrous, it's tons of fun and giggles! His office was burglarized and the nitrous oxide tank thingy was stolen. The cops saw the marks of dragging something on the sidewalk outside the office, they followed it around the corner and into the next building into a side entrance where the scrape marks led to a door of a janitor room or something. They found two guys in there with the tank. I don't know if they had used it but it was funny how it was recovered.

p.s. What is an AA machine?

 

When you use the nitrous without oxygen, brain damage/ death is very easy.

 

Makes your car run faster two.

 

I recall , a long time ago, a brilliant local college student putting a plastic tent over his four poster bed and running the nitrous oxide hose underneath.....


....what you assume happened, happened.

 

Actually, it's nitromethane that makes cars go faster, not nitrous oxide ... unless you're talking about giving to the driver.

 

AA is Atomic Absorption, simplified, a dissolved substance is burned and the gas given off analyzed with spectroscopy. Oxygen is the usual oxidizing agent used, but nitrous oxide can also be used as the oxidizing agent. @Michael K yeah, living organisms would probably need some oxygen also.