The most-prized turquoise color is an even, intense, medium blue, sometimes referred to as robin's egg blue or sky blue in the trade. The traditional source for this color is the Nishapur district of Iran, so you'll also hear it described as “Persian blue,” whether or not it As can be seen in Fig. 6 (a) and (b) as ieased from 20 to 80 mg/L, the percentage of dye removed is being decreased with mixing time from 10 to 100 min at a solution pH of 2, ambient temperature (25 ± 2 °C) and adsorbent dosage of 0.5 g/100 ml of calcined and raw EC adsorbent respectively.The most-prized turquoise color is an even, intense, medium blue, sometimes referred to as robin's egg blue or sky blue in the trade. The traditional source for this color is the Nishapur district of Iran, so you'll also hear it described as “Persian blue,” whether or Maude magnesite, epoxy, and resin. In addition to fake turquoise, some sellers will disguise their stones by grounding up genuine turquoise and mixing it with other stones. Another way to distinguish between magnesite and a matrix is to look for a black or green vein in the stone. Black turquoise is less valuable than blue-green.
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