[Jewelry making - Article 00341] - Re: [Orchid] Tumbago alloy

[brian]

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>         Tumbaga was used in pre-Columbian times (roughly from 600 A.D.
>     on) from Central America to Peru and Chile as a generic term for
>     any combination of gold and copper. 

    Thank you for that detail, Rick. 
    Do you know what their source of the acid was for depletion gilding? 
    Rhubarb leaves perchance? 

Cheers
Brian

e y e g l a s s e s   j e w e l l e r y
Auckland NEW ZEALAND
www.adam.co.nz


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