[Jewelry making - Article 00821] - Re: [Orchid] Heat treated chalcedony gone awry?

[Ray Prater, Jr.]

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>      Interesting - I too made a necklace with multicolor pink to blue
>     chalcdony briolettes only to notice last week that the colors had
>     indeed changed

    Any agate or chalcedony that is bright pink, purple, blue, green, or
    teal in color has been dyed. The organic dyes are light--sensitive
    and will fade with time, especially under sunlight or fluorescent
    light due to the UV content. The most stable color seems to be green.
    Once the color has faded, nothing can be done except to try more dye.
    Beads and cabs may be treated by a different process than slabs,
    nodules, and bookends. There are methods of coloring agate and
    chalcedony that use inorganic chemicals and these colors (such as
    black onyx) shouldl be stable. Heat-treated agate should also be
    stable.

Ray


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