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  2. Invisible ink - Wikipedia

    en.wikipedia.org/wiki/Invisible_ink

    Invisible ink, also known as security ink or sympathetic ink, is a substance used for writing, which is invisible either on application or soon thereafter, and can later be made visible by some means, such as heat or ultraviolet light.

  3. How to Use a Color Wheel to Get Perfect Color Pairings Every Time

    www.aol.com/lifestyle/color-wheel-perfect-color...

    Color Wheel Terminology. Neutral: black, white, brown, and gray Complementary: opposites on the color wheel, which appear brighter when they are used together (examples: yellow and purple, red and ...

  4. UV marker - Wikipedia

    en.wikipedia.org/wiki/UV_Marker

    UV marker with UV led lamp. An ultraviolet (UV) marker is a pen whose marks are fluorescent but transparent; the marks can be seen only under an ultraviolet light.They are commonly used in security situations to identify belongings or to prevent the reproduction of unauthorized banknotes.

  5. Color wheel (optics) - Wikipedia

    en.wikipedia.org/wiki/Color_wheel_(optics)

    A common application of the color wheel is to provide a color filter for a single-chip projector, which would otherwise only be able to display a greyscale image. The color wheel is placed in front of the light source (usually a metal-halide lamp) and spins rapidly, splitting the light into red, green, and blue primary colors. The chip then ...

  6. Domain coloring - Wikipedia

    en.wikipedia.org/wiki/Domain_coloring

    Domain coloring plot of the function f(x) = ⁠ (x 2 − 1)(x − 2 − i) 2 / x 2 + 2 + 2i ⁠, using the structured color function described below. In complex analysis, domain coloring or a color wheel graph is a technique for visualizing complex functions by assigning a color to each point of the complex plane. By assigning points on the ...

  7. 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 ...

  8. Bradley color wheel - Wikipedia

    en.wikipedia.org/wiki/Bradley_color_wheel

    The color wheel was designed to allow teachers to demonstrate how colors mixed and worked together. The wheel was based on the Maxwell Disk, [1]: p. 20, 34 a simple tool created by cutting a radial split in two or more colored disks and joining them. By doing so, colors could be mixed by rotating the disks to show a different proportion of each ...

  9. List of Crayola crayon colors - Wikipedia

    en.wikipedia.org/wiki/List_of_Crayola_crayon_colors

    In 1997, Crayola released a 16-pack of Color Mix-Up Crayons, each of which contains a solid color with flecks of two other colors in it. [19] Colors in the chart below are approximated. The hex RGB values are in the order of the predominant color and then the flecks.

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