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  2. Ultramarine - Wikipedia

    en.wikipedia.org/wiki/Ultramarine

    ISCC–NBS descriptor. Deep blue. B: Normalized to [0–255] (byte) Ultramarine is a deep blue color pigment which was originally made by grinding lapis lazuli into a powder. [2] Its lengthy grinding and washing process makes the natural pigment quite valuable—roughly ten times more expensive than the stone it comes from and as expensive as gold.

  3. Violet (color) - Wikipedia

    en.wikipedia.org/wiki/Violet_(color)

    In the 18th century, purple was a color worn by royalty, aristocrats and other wealthy people. Good-quality purple fabric was too expensive for ordinary people. The first cobalt violet, the intensely red-violet cobalt arsenate, was highly toxic. Although it persisted in some paint lines into the 20th century, it was displaced by less toxic ...

  4. Why Is College Tuition So Expensive? - AOL.com

    www.aol.com/finance/why-college-tuition-us...

    The very complicated question about why tuition has gotten so expensive boils down to the most basic economic principle: supply and demand. In American colleges, and through the Department of ...

  5. William Henry Perkin - Wikipedia

    en.wikipedia.org/wiki/William_Henry_Perkin

    The colour purple, which had been a mark of aristocracy and prestige since ancient times, was especially expensive and difficult to produce. Its extraction was variable and complicated, and so Perkin and his brother realised that they had discovered a possible substitute whose production could be commercially successful.

  6. Amethyst - Wikipedia

    en.wikipedia.org/wiki/Amethyst

    The ideal grade, called "Deep Siberian", has a primary purple hue of around 75–80%, with 15–20% blue and (depending on the light source) red secondary hues. "Rose de France" is defined by its markedly light shade of the purple, reminiscent of a lavender / lilac shade. These pale colors were once considered undesirable, but have recently ...

  7. Yixing ware - Wikipedia

    en.wikipedia.org/wiki/Yixing_ware

    Yixing ware. Five Yixing clay teapots showing a variety of styles from formal to whimsical. Yixing clay ( simplified Chinese: 宜兴泥; traditional Chinese: 宜興泥; pinyin: Yíxīng ní; Wade–Giles: I-Hsing ni) is a type of clay from the region near the city of Yixing in Jiangsu Province, China, used in Chinese pottery since the Song ...

  8. Lean (drug) - Wikipedia

    en.wikipedia.org/wiki/Lean_(drug)

    Lean or purple drank (known by numerous local and street names) is a polysubstance drink used as a recreational drug. It is prepared by mixing prescription-grade cough or cold syrup containing an opioid drug and an anti-histamine drug with a soft drink and sometimes hard candy .

  9. Why Are Flights So Expensive Right Now? 7 Factors ... - AOL

    www.aol.com/finance/why-flights-expensive-now-7...

    Why are flights so expensive in 2023? Flights cost even more in early 2023 than they do now. Factors such as fuel costs, staffing shortages, aging IT infrastructure and hidden fees all contribute ...

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