Weird 1982 Proof Set

[jlb783]

I came across a 1982 proof set the other day and the silver coins were rainbow toned but the copper cent and token were brown. The guy selling it said he thought some sort of gas had gotten in the case, but I have no idea.
Can anybody explain what they think may have happened?

 

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[alpha105]

Silver Tones....and copper is brown..... Posting pics would be the best bet.

 

[jlb783]

Silver Tones....and copper is brown..... Posting pics would be the best bet.

The coins were not real silver, I just meant that the silver colored ones (dime, nickel, quarter, half dollar) were.
I have never seen a proof or mint set with a brown cent, it is toned or the same red color.
I don't know if what the guy selling it is said is true or if it just toned with age.
And I know pics would be best but I don't own the proof set.

 

[alpha105]

Ahhh....to be fair though any silver colored coin can tone i've noticed.......i just pulled a 1989-S Half dollar out of a box of halves and its slightly toned......wouldnt doubt that they were actually toned as mint sets are sealed pretty nicely......

 

[jlb783]

Ahhh....to be fair though any silver colored coin can tone

Yeah I know

 

[jlb783]

wouldnt doubt that they were actually toned as mint sets are sealed pretty nicely......

Did you mean you would doubt?

 

[alpha105]

nope....i'm thinking it could be toned

 

[Jeffro]

Sunlight will tone- there's your answer of sorts. The set has been left out and exposed, my best guess anyways. Nothing really weird about it?

 

[jlb783]

Sunlight will tone- there's your answer of sorts. The set has been left out and exposed, my best guess anyways. Nothing really weird about it?

But it is toned on both sides of the coins.

 

[jlb783]

I know that the coins being toned isn't weird but I thought that the brown cent and token was weird because I have never seen that before.

 

[Digginnit]

I might be wrong but somewhere in the past I read about heating coins in the oven, after you've applied some chemical, to tone them. I guess if they were sealed in plastic it could do the same thing. It's a memory fragment so I could be way off base.