Private keys on physical storage??

[ScryptAsic]

There are a lot of physical storage solutions available online including physical bitcoins and alts.
I am thinking of buying a few but how do i know that should i want to peel the coin in a few years that the private key will still be legible to read.
I'm not a chemist or scientist but paper without oxygen cants be a good thing. Will the private keys on casascius coins be redeemable in 5 years and plus? 

[AT101ET]

Casascius released his statement of controls when selling his coins. This lists the efforts he went through and details the assembly process. You can find it on his site: https://www.casascius.com/controls.aspx

[ScryptAsic]

But will the private keys still be reddeemable in a few years as the paper might break down and the private key won't be readable.?

[miffman]

It's a good idea to use acid free paper to print the private keys.

[OgNasty]

This is why we engrave our private keys on our Minted Seats.

https://bitcointalk.org/index.php?topic=352515.0

[TookDk]

But will the private keys still be reddeemable in a few years as the paper might break down and the private key won't be readable.?

FWIIW:
I got my hands on two newly redeemed casascius coin this week, the coins are a little more than 3 years old.
The private keys was in perfect condition, no signs of deterioration or fainted color.

[ScryptAsic]

The engraving keys is a good idea. I like it. Does anyone know if the casacius coin also has acid free paper or is it normal paper. What about other coin makers on here?.

[ScryptAsic]

I also forgot. Thank you for your help.

[owlcatz]

This is an interesting topic. Not sure how i ever missed it, owning a couple of nastyfans coins myself, makes me even more impressed in that operation, and happy to be a member!  

As for the paper. I've tried googling about it in oxygen free environments, and it sounds like it can degrade over time, but I found the results basically inconclusive, and I also don't know what kind of paper Mike used.

[Zeroxal]

This is an interesting topic. Not sure how i ever missed it, owning a couple of nastyfans coins myself, makes me even more impressed in that operation, and happy to be a member!  

As for the paper. I've tried googling about it in oxygen free environments, and it sounds like it can degrade over time, but I found the results basically inconclusive, and I also don't know what kind of paper Mike used.

Mike used laser printing on the private keys, which ensures that the color won't fall off after a shirt period of time. It's more about the ink than the paper used.