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Knowledge Base:  
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Blue Green
Last Updated: 11/17/2008
Ingredients
Sodium Thiosulfate... 1/4 oz  
               Ferric Nitrate... 2 oz
Distilled Water... 1 quart
Process
Hot process. Solution hot (180 to 190°F), metal hot (200°F), cold wash water applied after metal has cooled to around 100°F. Wash solution over metal surface, let dry, then wash piece in cool water. Repeat until color develops. For Yellow Green, dip in dilute nitric acid, then wash and dry.

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