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  2. Color of water - Wikipedia

    en.wikipedia.org/wiki/Color_of_water

    Color variations can be measured with reference to a standard color scale. Two examples of standard color scales for natural water bodies are the Forel-Ule scale and the Platinum-Cobalt scale. For example, slight discoloration is measured against the Platinum-Cobalt scale in Hazen units (HU). [12] The color of a water sample can be reported as:

  3. Forel-Ule scale - Wikipedia

    en.wikipedia.org/wiki/Forel-Ule_scale

    The set of vials is then compared with the color of the water body. The result is a color index for the water body which gives an indication of the transparency of the water and thus helps to classify overall biological activity. The color graduations correspond to open sea and lake water colors, as they appear to an observer ashore or on board ...

  4. Ocean color - Wikipedia

    en.wikipedia.org/wiki/Ocean_color

    Ocean color data is a key tool for research into how marine ecosystems respond to climate change and anthropogenic perturbations. [29] One of the biggest challenges for ocean color remote sensing is atmospheric correction, or removing the color signal of the atmospheric haze and clouds to focus on the color signal of the ocean water. [30]

  5. List of inorganic pigments - Wikipedia

    en.wikipedia.org/wiki/List_of_inorganic_pigments

    Raw umber (PBr7): a natural clay pigment consisting of iron oxide, manganese oxide and aluminum oxide: Fe 2 O 3 + MnO 2 + n H 2 O + SiO 2 + Al 2 O 3. When calcined (heated) it is referred to as burnt umber and has more intense colors. Raw sienna (PBr7): a naturally occurring yellow-brown pigment from limonite clay. Used in art since prehistoric ...

  6. Water - Wikipedia

    en.wikipedia.org/wiki/Water

    The scale is an absolute temperature scale with the same increment as the Celsius temperature scale, which was originally defined according to the boiling point (set to 100 °C (212 °F)) and melting point (set to 0 °C (32 °F)) of water. Natural water consists mainly of the isotopes hydrogen-1 and oxygen-16, but there is also a small quantity ...

  7. Graceanna Lewis - Wikipedia

    en.wikipedia.org/wiki/Graceanna_Lewis

    Chart of the Animal Kingdom. Chart of the Vegetable Kingdom. A Chart of the Class of Birds. A Chart of Geology, with Special Reference to Paleontology. Microscopic Studies of Frost Crystals. Plumage of Birds. Lower Forms of Animal and Vegetable Life. Studies in Forestry, Illustrated by Watercolor Paintings. Water Color Paintings of Wild Flowers.

  8. Color chart - Wikipedia

    en.wikipedia.org/wiki/Color_chart

    Color chips or color samples from a plastic pellet manufacturer that enables customers to evaluate the color range as molded objects to see final effects. A color chart or color reference card is a flat, physical object that has many different color samples present. They can be available as a single-page chart, or in the form of swatchbooks or ...

  9. Ultramarine - Wikipedia

    en.wikipedia.org/wiki/Ultramarine

    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.

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