Editing Turquoise (section)

=== Zachery treatment===
A proprietary process was created by electrical engineer and turquoise dealer James E. Zachery in the 1980s to improve the stability of medium to high-grade turquoise. The process can be applied in several ways: either through deep penetration on rough turquoise to decrease porosity, by shallow treatment of finished turquoise to enhance color, or both. The treatment can enhance color and improve the turquoise's ability to take a polish. Such treated turquoise can be distinguished in some cases from natural turquoise, without destruction, by [[energy-dispersive X-ray spectroscopy]], which can detect its elevated potassium levels. In some instances, such as with already high-quality, low-porosity turquoise that is treated only for porosity, the treatment is undetectable.<ref>{{cite journal |last1=Fritsch |first1=Emmanuel |last2=McClure |first2=Shane F. |last3=Ostrooumov |first3=Mikhail |last4=Andres |first4=Yves |last5=Moses |first5=Thomas |last6=Koivula |first6=John I. |last7=Kammerling |first7=Robert C. |title=The identification of Zachery-treated turquoise |journal=Gems & Gemology |date=Spring 1999 |volume=35 |pages=4–16 |doi=10.5741/GEMS.35.1.4 |url=https://www.gia.edu/doc/The-Identification-of-Zachery-Treated-Turquoise.pdf |access-date=14 May 2022}}</ref><ref name="Schwarzinger22017">{{cite journal |last1=Schwarzinger |first1=Bettina |last2=Schwarzinger |first2=Clemens |title=Investigation of turquoise imitations and treatment with analytical pyrolysis and infrared spectroscopy |journal=Journal of Analytical and Applied Pyrolysis |date=May 2017 |volume=125 |pages=24–31 |doi=10.1016/j.jaap.2017.05.002}}</ref>