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Old iridescent marbles?


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3 hours ago, lstmmrbls said:

no "Old" marbles were purposefully made iridescent

I've wondered about this one. Looking at auctions on ebay.fr you frequently come across iridescent marbles in lots where the others are clearly vintage - now marbles of different ages do get mixed together, but I wonder whether they were made in Europe earlier than is generally suspected? 

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Manofkent

 I also wonder because I have one that was in with some vintage marbles. The thing about it is that there is a patch over the iridescent part that is not iridescent. I think Steph is right about being buried, and some glass must be more susceptible to change due to minerals in the soil. Ionknow!

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4 hours ago, budwas said:

. . . I think Steph is right about being buried, and some glass must be more susceptible to change due to minerals in the soil.

I've noticed -- primarily with Alley cullet, anyway -- that dark blue seems particularly susceptible to iridescence during burial.  Those so-called Alley "Abalones" are a product of that . . .

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