Passing through, I saw some bright blue objects under a shady tree, and I thought I had found some turquoise jewels, but no — it was wads of blue chewing gum! Actually, the color was pale sky ...

The small case of blue turquoise, for example, held 14 cut and polished stones of different sizes and from different countries, ranging from a pale tint to a deep ocean hue. Other cases contained ...

These finishes are pre-patinated at the Aurubis mill to create the green/blue/turquoise patina that naturally develops over time with exposure to the environment. The pre-patination process ...