Sunday, 8 April 2012

#206 In the foundry: "Eclipse" patina . . .

To know the fascinating story of the horse named Eclipse,
refer to Post #152, February 4, 2012.

The patina for Eclipse was achieved using the following method: The cold bronze was doused with liver of sulfur (below) and then rinsed.  At right, the bronze was heated with a propane torch, then cupric and ferric nitrate was alternately sizzled and stippled on the hot bronze.

This application is a traditional, old world patination.
Bronze is over 95% copper and typically, depending on atmospheric conditions, location and other issues, turns
blue green without chemical inducement.  We've all found
an old copper penny with a natural blue green patina.

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