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 Post subject: Re: Yellowing opal
PostPosted: Wed May 26, 2021 4:29 pm 
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Location: San Francisco
on white


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 Post subject: Re: Yellowing opal
PostPosted: Wed May 26, 2021 8:26 pm 
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Well, the yellow is still very strong. I guess it is not reversible. I wonder what is causing it?


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