Are Dansco Albums Good?

When you state OLD I wonder if your referring to those OLD FOLDERS, not Albums. If those are Folders, then the coins were exposed to anything and everything. If they are actually Albums, were the plastic slides in place. Regarless, a call to Whitman Publishing would indicate that they have never used Sulfured type of paper for coins. However, this too may not be accurate since the same people are not there today that were there 50 years ago. Also, not sure if true but I've read somewhere that Whitman has been bought out by someone and old records may now have been lost.
If I were you I'd still check out the area where those coins were stored. Might be a problem in the area.

Are you taking any measures to eliminate moisture/humidity? Ziploc bags with desiccant packs?

I have the original line of Whitmans first releases that were issued for Canadian coins. For example the originals had only one socket for the 1926 five cent piece. These folders date to the late 50's.

These albums were purchased POPULATED as keepsakes in the late 70's and have been populated for some time (That's give or take 30 years fully populated at the very least). I've left them intact as I believe it's not about the coins in them so much as it's an item/entity in itself. I have a separate collection of properly kept and cared for coins.

In the silver holding folders (let's say a no 9065 containing Canadian dimes from 1858 to 1936) all the sterling silver shows a heavy gloss like toning almost as if the coins were varnished on the high points. This is weird but I accept it as part of owning a completed folder. On later silver when they switched to .800 fineness, it's fairly obvious that toning starts at the rim and moves inwards on the coins resulting in some rainbow colour natural toning. I don't know about you but I figure there's something in there reacting with the silver because it's obviously beginning at the point where the coin is touching the album.

In the copper albums (no 9004 Lincoln heads 1909-1940, no 9062 Canada small cent 1920-1957 for example) the copper is evenly toned mostly medium brown and shows glints of red on the high points where the albums touch the coin surfaces. I have noticed absolutely no green except on one 1916-D Lincoln head. Since most of these coins were circulated before populating these albums, I assume they've been exposed to other environmental concerns first. The older large cents (Canada 1858-1920 Whitman no 9061) gives up coins with a very deep chocolate toning.

Anyhow, I don't recommend you start and maintain a collection in these, it's obvious they damage coins but they are a piece of collecting history and interesting in themselves. I treat the albums as curiosities of collecting (see how they USED to do it?) and they receive no special consideration or storage from myself beyond the standard humidity control that is present in my den (because of the books).