Who created the Zachary process of turquoise?
not sure…. J. C. Zachary , Enhanced Turquoise (Zachary Process) Enhanced turquoise has been treated with chemicals, then heated. The heating process eliminates any residual chemicals in the turquoise. Therefore, it is difficult to tell the difference between enhanced turquoise and natural, untreated turquoise. Unlike natural turquoise, enhanced turquoise usually does not turn green over time.
