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I see that Harris goes out of their way to say: "made of acid free materials." So... is there a difference between Whitman classic blue folders and Harris folders (owned by Whitman Publishing now)?
As already noted there is a massive difference in Folders and Albums. Acid free paper is not the problem with Folders. Remember a Folder is just that, something that folds, has coins pressed into slots, no rear visable, Made of paper and cardboard. The primary problem with folders is multiple.
1. You must press a coin into a tapered slot usually with your thumb. I've heard fo people that use a rubber mallet. By tapered, the slot is made so the top of the sloted cardboard is smaller than the bottom. That is why it is hard to press the coins in but once in they smap into place. Regardless, the obverse could end up with your thumb print forever.
2. The process to make them is to slab Glue on a sheet of paper, drop the slotted cardboard onto that, run through a cutting machine and presto, you have a folder. After the priting of course. Now look at the rear of the slots. Notice the shinning stuff. That is the glue and as any kid can tell you if your coins are worn, just spit on that glue and it will now hold the coin in place.
3. Every time you open your Folder you or someone will touch those coins again. More finger prints, your breath, rain if your outside, some of your lunch or dinner if your slobby.
An Album is sort of like a book with pages that have coin visabilty front and rear, plastic slides to protect the coins from touch and stuff.
As to safety in using Whitman Albums. I presently have well over 100 of them and all in Zip Lock Plstic bags. Some of my coins have been in those Albums since the Albums were invented so by long term storage. Yes, they are great.
Actually almost any Album is great for long term storage but you must remember that none of them are air tight. So regardless of the brand, placing them in a plastic bag further protects the coins for long term storage.