Toning on some Roosevelt Dimes.
jfriedm56
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When I first purchased these some 50 years ago, they were all bright white blazers. After 50 years sitting in a Whitman bookshelf album they seem to have picked up a little color. Some are nicer than others, but they all have their own thing going on. Wondering why some have somewhat light toning and others fully toned. And the typical ring toning. Do different amounts of sulfur in the paper contribute to this? 
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Comments
Yeah, I’ve seen similar toning with Whitman albums for Roosevelts. The different coins can tone differently for more than one reason. Some coins, even blast white looking ones, can have a thicker skin than others. Like if a coin was freshly minted its metal is more reactive than one that’s been around for a year or 2. Or if just by chance was exposed to less things like atmospheric sulphides than others. Also if one was dipped in Ezest it would react more than an undipped one. Also if the slides let in more air/gasses over one coin than another. Proximity closer to the edges of the page allowing condensation with temp fluctuations making films grow at different rates. Stuff like that.
Mr_Spud
Here’s one I bought slabbed that I’d bet money on it coming from a Whitman Bookshelf Album
Mr_Spud