Found a Whitman folder in abandon house,need help with what's inside. 60s -70s coins.

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sorry here is the reverse,they are all like this,shiny on one side and blaaa on the other. Did someone spray something on these? They were in a little room with a hot water heater.

 

That's what cardboard albums do. The sulfur and/or acid in the paper reacts with the parts of the coins that are exposed to it. The hotter and more humid the surroundings, the faster and more extensive the reaction.

 

It's like jeff says and when I messaged you I did not know the reverse's were like this. I'm not sure there is any hope for this type of damage, but at least they are not rare dates. But make sure to check for any varieties you might like to keep.

 

The ones on the top row don't match the dates on the folder.

 

Yeah,when I first opened it I saw the 1950,then a 2001 coin. I was disapointed. I just don't understand why the reverse is so dull and the obverse is shiny? I would think being in a folder the reverse would be protected and new.But some of the toning on these coins are awesome,lots of reds and blues.I'll flip them all and mark them heater coins,why not!

 

@-jeffB gave you the correct answer in post #3

 

I understand the answer,i get how it happened,i guess im astounded that it would do THIS. Well then what is the best way to store coins in folders so this will not be a problem? Because this makes me want to take all my coins in folders and put them in something else that will stand time better. No heat,I get that,dry I get that, anything else that I should know about these folders so as not to waste 1000s of dollars in coins because a folder decides to EAT half of them away lol.

 

If you're spending thousands on coins, shell out tens of dollars for capsules or soft archival flips. Better albums (like Dansco) won't degrade your coins nearly as quickly. Don't put forty-dollar coins in a four-dollar album!

Copper (and copper-coated zinc) cents are particularly bad for changing color over time. Silver changes more slowly, but will change in an album. Cupronickel (nickels and clad coins) is much more resistant, but even that can tone or corrode if stored improperly. Gold is pretty resistant to toning, but I've never seen a Whitman cardboard folder for gold...

 

Thank you so much for the advice. I do have some of the air tight capsules that I've put my best finds in,and alot of 2x2 flips that I have put alot of my bu coins in. But I just started putting those in tubes by year.
Where I just started on this adventure,I still have so much to learn and I want to do it right.I've had other collections ruined because I didn't store them right.I DO NOT want to make that same mistake again. Thats why I love this sight,everyone helps everyone and I always seem to leave with more knowledge everyday. Thanks for all the help guys and ladies, and for putting up with my boring questions. Happy Hunting!