What Makes Turquoise Change Color?
https://nativeamericanjewelrytips.wordpress.com/2010/12/30/what-makes-turquoise-change-color/
Turquoise is porous. Grease and oil can change the color of natural turquoise by seeping into its pores. I’m not talking about car grease and oil here, but simply human body oils and products we all use around the home every day.
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