[Jewelry making - Article 00211] - Re: [Orchid] Tumbago alloy

[Phyllis Richardson]

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    In his book Emmerich has a long list of bibliographies used in his
    research, to which he frequently refers. 

    Under the section covering Casting, alloying and gilding, one of the
    first mentions of using copper when smetlting gold is on page163
    when he mentions notes by Sir Walter Raleigh when he described
    Indian metalworking in Columbia in 1596. 

    On page 164 a direct quote. 

          "Sir Walter Raleigh's observation conerning the "part of
          copper" added to the gold, without which the Indins could not
          work it, has been thought by some to account for the great
          importance in pre-Columbian metalllurgy of the gold-copper
          allooy called tumbaga by the Spaniards. In a well-reasoned
          article Root (listed in the biography section) has concluded
          that tumbaga was in fact used so widely because it gave the
          Indians a way to use the copper they had in the manufacture of
          metal objects which would still be gold in color". 

Phyllis Richardson 


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