Penny sleeves discolor top loaders

I have been out of collecting for about 15 years now. I just recently took a look at my cards and noticed that the top loaders I used penny sleeves with have all changed color. The cards don't seem to be damaged but the top loader has turned yellow. Can this be dangerous to the cards? Has anyone else noticed this?


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Yup.
The current ones have a much lower acid-content and should stay clear longer.
<< <i>The problem is with the toploader. It is not acid free or for that matter archival safe. I have a bunch that turned yellow as well but it doesn't have to do with the penny sleeve. All of my raw cards are in penny sleeves and toploaders but only some have yellowed, not all. I bought a bunch of loaders really cheap years ago and they are all yellow. >>
I have the same issue. Definitely not the sleeve either. I had a bunch of packages that I bought years ago and just opened a couple recently. All were yellow and yes I got them cheap. Just another example of you get what you pay for!