[Jewelry making - Article 01534] - Re: [Orchid] Amber colors....

[Alain van Acker]

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Hi,

    The colour of blue and green amber is contributed to fluorescence in
    natural daylight. Delocalized ions are said to be the cause of colour
    for the other colours. 

    Amber may be dyed, coated etc or heated to darken/alter the colour. 

    http://gemologyproject.com/wiki/index.php?title=Amber 

Alain
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