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  2. Show globe - Wikipedia

    en.wikipedia.org/wiki/Show_globe

    Next to their origins, the greatest debate about show globes is what, if anything, the colors of the liquids symbolized. Red and blue may have indicated arterial and venous blood. One belief was that if the globe was filled with red liquid there was a plague in town, but if it was filled with green all was well.

  3. Thermochromism - Wikipedia

    en.wikipedia.org/wiki/Thermochromism

    On cooling, the compound becomes a light yellow metastable phase, which over 2–3 weeks turns back into original red. [8] Many other tetrachloronickelates are also thermochromic. Bis(diethylammonium) tetrachlorocuprate(II) ([(CH 3 CH 2 ) 2 NH 2 ] 2 CuCl 4 ) is a bright green solid material, which at 52–53 °C reversibly changes color to yellow.

  4. Color of water - Wikipedia

    en.wikipedia.org/wiki/Color_of_water

    The intrinsic color of liquid water may be demonstrated by looking at a white light source through a long pipe that is filled with purified water and closed at both ends with a transparent window. The light cyan color is caused by weak absorption in the red part of the visible spectrum .

  5. Blue bottle experiment - Wikipedia

    en.wikipedia.org/wiki/Blue_bottle_experiment

    Blue bottle reaction video. The blue bottle experiment is a color-changing redox chemical reaction. An aqueous solution containing glucose, sodium hydroxide, methylene blue is prepared in a closed bottle containing some air. Upon standing, it spontaneously turns from blue to colorless due to reduction of methylene blue by the alkaline glucose ...

  6. Vermilion - Wikipedia

    en.wikipedia.org/wiki/Vermilion

    The shade of red of the lacquerware has changed over the centuries. During the Eastern Han dynasty (25–220 AD) the Chinese word for red referred to a light red. However, during the Tang dynasty (618–907), when the synthetic vermilion was introduced, that color became darker and richer.

  7. Glass coloring and color marking - Wikipedia

    en.wikipedia.org/wiki/Glass_coloring_and_color...

    Beer bottles of different colors. Glass coloring and color marking may be obtained in several ways. by the addition of coloring ions, [1] [2] by precipitation of nanometer-sized colloids (so-called striking glasses [1] such as "gold ruby" [3] or red "selenium ruby"), [2] Ancient Roman enamelled glass, 1st century, Treasure of Begram

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