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DIY: Mixing Colors | Causes of Color font size: a a a Related pages: Color Theory Color mixing Representations Systems Energy of color Do it Yourself Do it Yourself 2 A page from the "Causes of Color" exhibit... Mixing Colored Inks and Paints All color printing processes use something called the subtractive mixing of colors to take out portions of white light to produce the colors we see. You can illustrate this subtractive process while having some fun mixing different colored inks or tempera paints. Materials Tempera paints or printer inks in cyan, magenta, and yellow (Note: soap and water will clean up tempera paint, but you need isopropyl alcohol to clean up spilled ink.) White poster board, paper plates, or copy paper on top of newspaper Plastic spoons, brushes, or popsicle sticks How To Do It Put an equal amount of cyan, magenta, and yellow paint equidistant from each other in a circle on a white poster board, paper plate, or piece of copy paper. Use a clean brush, spoon, or popsicle stick to mix a little magenta and yellow paint. You might see a red color. Use another clean implement to ... http://www.webexhibits.org/causesofcolor/1BF.html · 12.7k |
DIY: Mixing Lights | Causes of Color font size: a a a Related pages: Color Theory Color mixing Representations Systems Energy of color Do it Yourself Do it Yourself 2 A page from the "Causes of Color" exhibit... Mixing Colored Lights Have you ever wondered why humans perceive the colors we see? By shining lights of three different colors against a white background, you better understand how human eyes “see” color. Materials One red, one blue, and one green light. You can use three different colored light bulbs, each in its own socket; three different LED lamps, similar to those that a DJ uses; or three flashlights of equal size and brightness, each with a double layer of red, green, or blue cellophane attached with a rubber band. A white wall, paper, or poster board. How To Do It Tape a piece of white poster board or about 8 pieces of white copy paper to a wall in a dark room. (Notes: You can also use a white wall. A white projector screen does not work well.) Turn the lights on and position them until you get the “whitest” light where the three colors mix. For best results, the room should be as ... http://www.webexhibits.org/causesofcolor/1BE.html · 13.2k |
Color mixing | Causes of Color font size: a a a Related pages: Color Theory Color mixing Representations Systems Energy of color Do it Yourself Do it Yourself 2 A page from the "Causes of Color" exhibit... What color do you get when you mix blue and yellow? Primary colors and mixing of colors If you mix red, green, and blue light, you get white light. Red, green, and blue (RGB) are referred to as the primary colors of light. Mixing the colors generates new colors, as shown on the color wheel or circle on the right. This is additive color. As more colors are added, the result becomes lighter, heading towards white. RGB is used to generate color on a computer screen, a TV, and any colored electronic display device. When you mix colors using paint, or through the printing process, you are using the subtractive color method. The primary colors of light are red, green, and blue. If you subtract these from white you get cyan, magenta, and yellow. Mixing the colors generates new colors as shown on the color wheel, or the circle on the right. Mixing these three primary colors generates black. As you ... http://www.webexhibits.org/causesofcolor/1BA.html · 14.5k |
DIY: Chlorophyll Chromatography | Causes of Color font size: a a a Related pages: Pigments Plants Animals Humans Fall & fruit Flamingos Cabbage Chlorophyll Do it Yourself A page from the "Causes of Color" exhibit... Chlorophyll Chromatography If chlorophyll is green, how is it possible that leaves turn red, gold, and orange in the fall? With a few simple materials, you can easily discover the answer to this question. Materials Green leaves (spinach works best) Isopropyl alcohol (rubbing alcohol) Coffee filter Scissors Small glass jar (mayonnaise, pickle, or jelly size) Mixing bowl What To Do Pour about half an inch of rubbing alcohol into the bottom of a clean, empty jar. (Note: Alcohol is flammable and should be used with care.) Tear up the green leaves into small pieces. Put enough green leaf pieces in the jar with alcohol to cover the bottom of the jar. Cover the jar and place it in a bowl of hot tap water for about one hour. Stir the leaves vigorously from time to time. If the water becomes tepid, replace it with hot water. Prepare the coffee filter by opening it up and cutting a 1” x 6” ... http://www.webexhibits.org/causesofcolor/7E.html · 12.6k |
Representations | Causes of Color font size: a a a Related pages: Color Theory Color mixing Representations Systems Energy of color Do it Yourself Do it Yourself 2 A page from the "Causes of Color" exhibit... How do you represent colors? There is debate over which type of color circle or color wheel is most accurate, though there is merit in any color circle arranged in a logical sequence. A color wheel has colors arranged according to a chromatic relationship (visual), and helps us understand the relationships between colors. Primary colors are equidistant, colors opposite one another are complementary, and colors placed beside one another are analogous, mimicking the process that occurs when we blend hues. There are essentially three different types of color circles. Conceptually, the oldest of all color circles is based on subtractive color and uses cyan, magenta, and yellow as the primary colors. Often blue, red and yellow are used as the primaries, instead of cyan, magenta and yellow. This variation is historical in origin, and based on the availability of pigments. Painters and printers favor ... http://www.webexhibits.org/causesofcolor/1BB.html · 20.3k |
Systems | Causes of Color font size: a a a Related pages: Color Theory Color mixing Representations Systems Energy of color Do it Yourself Do it Yourself 2 A page from the "Causes of Color" exhibit... How do colors change on the screen compared to when printed? Computer "spectrum". Mixing the primary colors, as shown in the narrow bands above, creates the colors of the broad upper band. TV and computer screens The images displayed on television and computer screens are made up of pixels, each produced by mixing red, green, and blue dots in varying proportions. A combination of all three at maximum brightness will appear white from a distance. A mix of red and green produces yellow; red with blue creates magenta; and green with blue produces cyan. On a screen, varying the proportions of the primary colors creates the whole range of color. Reproducing color The range of colors varies enormously across different media. Of the billions of colors in the visible spectrum, a computer screen can display millions, a high-quality printer in the order of thousands, and older computer systems may ... http://www.webexhibits.org/causesofcolor/1BC.html · 11.5k |
Snow & ice | Causes of Color font size: a a a Related pages: What color is water? Colors from vibrations Snow & ice Colors from bacteria A page from the "Causes of Color" exhibit... Why are glaciers blue? (vibrations & rotations) Icebergs floating near Seward and Tracy Arm, Alaska. Blue to blue-green hues are scattered back when light deeply penetrates frozen waterfalls and glaciers. Puddle of water on a glacier (Lassen Volcanic National Park). Majestic glaciers and thick snow banks act like filters that absorb red light, making a crevasse or deep hole appear blue. What causes the blue color that sometimes appears in snow and ice? As with water, this color is caused by the absorption of both red and yellow light (leaving light at the blue end of the visible light spectrum). The absorption spectrum of ice is similar to that of water, except that hydrogen bonding causes all peaks to shift to lower energy - making the color greener. This effect is augmented by scattering within snow, which causes the light to travel an indirect path, providing more opportunity for absorption. From the surface, ... http://www.webexhibits.org/causesofcolor/5C.html · 12.1k |
Fall & fruit | Causes of Color font size: a a a Related pages: Pigments Plants Animals Humans Fall & fruit Flamingos Cabbage Chlorophyll Do it Yourself A page from the "Causes of Color" exhibit... Why are leaves and fruit different colors? Autumn Colors The invigorating colors that deck deciduous trees in the fall are there all year round – it’s just that chlorophyll absorbs light so strongly that less intense colors are masked. Organic pigments such as carotene and quercetin can only be seen when the chlorophyll molecules decay in the fall, and the woodlands turn red, orange, and golden brown. As the chlorophyll in leaves decays in the autumn, the green color fades and is replaced by the oranges and reds of carotenoids. Similarly, chlorophyll can also be damaged when leaves are cooked. The molecules denature, and the central magnesium atom is replaced by hydrogen ions. This affects the energy levels within the molecule, causing its absorbance spectrum to alter. Cooked leaves are often paler and more yellow than fresh leaves. Chlorophyll is not a very stable compound. It is broken down in the ... http://www.webexhibits.org/causesofcolor/7C.html · 13.5k |
Animals | Causes of Color font size: a a a Related pages: Pigments Plants Animals Humans Fall & fruit Flamingos Cabbage Chlorophyll Do it Yourself A page from the "Causes of Color" exhibit... Blue frogs and white lions (biological pigments) A tiger’s stripes allow him to disappear into the jungle shadows. The plant and animal kingdoms abound with bright colors, from the lush green of photosynthesizing plants to the bold black and orange stripes of tigers. Color plays a multitude of roles in the natural world, used to entice, to camouflage, or to warn other creatures. Colors signal harvest time, breeding conditions, and the change of seasons, from the first greens of spring to the brilliant reds and browns of the fall. Pigments Pigments are chemical compounds responsible for color in a range of living substances and in the inorganic world. Pigments absorb some of the light they receive, and so reflect only certain wavelengths of visible light. This makes them appear "colorful.” Cave paintings by early man show the early use of pigments, in a limited range from straw color to reddish brown ... http://www.webexhibits.org/causesofcolor/7I.html · 31.2k |
Do It Yourself | Causes of Color font size: a a a Related pages: Blue or black sky? Blue & red Earth shadow Mars Blue eyes Do it yourself A page from the "Causes of Color" exhibit... Experiment with scattering in a glass Flashlight on the bottom of a glass of water & milk. As light passes through the liquid, the shorter wavelengths diffuse, and the light at the end is redder. With a few items from your kitchen, experiment with the real reason why the various colors in the sky exist, and why the sky turns red-gold at sunset and sunrise. Sunset in a glass This experiment replicates the scattering of small particles in the earth’s atmosphere in a glass of water, using a little bit of milk to scatter. Ingredients A clear glass pitcher or tall jar with straight sides Milk (2% or Whole is best, or dry milk power) Water Flashlight How to do it Fill a glass pitcher with water. Add milk a little bit at a time, just until the water is murky and translucent. (NOTE: if you use milk powder, add a pinch at a time. If you use skim milk, you’ll need more than with 2% or whole.) Place the flashlight so that ... http://www.webexhibits.org/causesofcolor/14F.html · 12.5k |
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