Will a coin retone at all after conservation

ColorFan

After conservation will a coin regain any of its previous toning after being reholdered in TPG plastic? Does anybody know or have any experience with this subject

ricko

@ColorFan ... Welcome aboard. As others have indicated above, there is no 'one' answer to your question. The variables have been enumerated above. A top tier slab will certainly prevent outside environmental conditions from incurring further tarnish. What traveled into the slab with the coin will be the main variable there. Tarnish is environmental damage. The more you restrict the environmental conditions, the less likely for the chemical reaction to occur. Cheers, RickO

Namvet69

Welcome. There has been much discussion of the effect of storage conditions on stabbed coins. Heat, cold, humidity, off gassing of nearby material, etc. Peace Roy

Jzyskowski1

Welcome.
The answer is maybe. As Roy mentioned lot of variables 😉🙀🦫

PerryHall

A coin can be dipped bright and then retone over time. It's called "secondary toning".

Oldhoopster

Short answer is: It Depends

What was the original condition? What type of conservation? What type of storage conditions? Have the surfaces been completely neutralized from the conservation chemicals? Every situation will be different.

Conservation may expose fresh metal to the atmosphere and that can be more reactive than the previously toned surfaces. How quickly and to what extent it retones is dependent on too many variables to accurately predict.

ColorFan

@Oldhoopster said:
Short answer is: It Depends

What was the original condition? What type of conservation? What type of storage conditions? Have the surfaces been completely neutralized from the conservation chemicals? Every situation will be different.

Conservation may expose fresh metal to the atmosphere and that can be more reactive than the previously toned surfaces. How quickly and to what extent it retones is dependent on too many variables to accurately predict.

I understand your point but in general if the restoration removes most of the moderate toning on a coin is it likely or not that some toning will reform in the new PCGS holder?

Jzyskowski1

The relevant part of the answer is what is revealed underneath toning or smuts.
The fresh metal is fair game.
There’s a little difference between rinsing a coin with acetone removing potential damage and whatever science is applied for each particular conservation zone
Thank you. Remember, collect what you like 😉🙀🦫

Sapyx

Slabbing a conserved coin will considerably restrict the ability of the coin to retone naturally. One of the reasons for slabbing is protecting the coin from corrosion, and "toning" is just socially acceptable corrosion.

MS66

@Sapyx said:
"toning" is just socially acceptable corrosion.

Or socially acceptable_ tarnish._..

BryceM

Even newly minted coins that appear to be perfectly blast white quickly acquire a thin layer of oxidation. Once the layer gets thick enough, we can perceive it. When coins are "conserved" or dipped, the acid removes this oxide layer and sets up the coin for another round of toning. Bare, raw silver is incredibly vulnerable as the oxide layer itself acts as a sort of (imperfect) barrier to additional toning. Whether additional toning happens very slowly, or quickly depends on the environment of the coin.

Modern slabs are pretty good (usually) at keeping this process to a minimum, but nothing can stop it completely. In millions of years all of our silver coins will have succumbed to the ravages of time and chemistry. It's a different story with gold and platinum.

neildrobertson

All coins tone, even in TPG plastic. It's just a question of how long it will take.