Foundry Work at Art Castings of Colorado /June 7, 2015 by John Parsons Charlotte with Art Castings of Colorado metal chasing "Through the Woods" bronze wild turkey. Art Castings of Colorado's master patina artist Nate Ford applying Liver of Sulfur to the bronze. Patina artist Chad Quam working on hen sculptures. Adding heat to aid reactions of chemicals to bronze. Nate applying highlights to the bronze. Completed Sculpture. Another beautiful job! Heading for home!