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 Post subject: Need Help Heat Treating Dark Green Nigerian Tourmaline
PostPosted: Sun Jul 31, 2011 8:31 pm 
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Want to know if anyone has ever Cooked Deep Green Nigerian Tourmaline I have very large peices but they are very very dark i like to lighten them up

I have Read that 3 hours of gradual increase in temperature to 520 C then holding it there for 2 hours might decrease the color saturation I like to know if this is true also do i need an oxygen inriched or reduced enviroment will yeild the best results for.

I have some very very large stones all ranging from 7 carats up to 44 carats so i really love some help with this one thanks


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 Post subject: Re: Need Help Heat Treating Dark Green Nigerian Tourmaline
PostPosted: Tue Aug 02, 2011 2:05 pm 
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first test in on way will use oxygen enriched enviroment will increase temp to 550c half way there so far will hold it at that temp for 1 hour will see if stone lightents up


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