There are two kinds of sodium lights: Low Pressure (LPS) and High Pressure (HPS). These lamps are mostly used for street lighting as well as industrial uses. The lamp works by creating an electric arc through vaporized sodium metal.
Enhanced Turquoise. Enhanced Turquoise is a natural stone that has only been treated with either chemicals and heat, or just heat to enhance the color and harden the stone. This type of treatment keeps the color from fading over time and makes more of the harder turquoise available for the market.
I like this shade, and to me, it is just as beautiful as the blue kind. If you buy turquoise that is green to begin with, you will save a lot of money. I bought some green turquoise necklaces, and they cost half of what the blue versions did. @sunnysideup â I don't know of any way to restore the color.