Color Absorption Answer Key

Color Absorption Mixing Pigments 1. What color do you get when you mix cyan (light blue) and yellow? Green 2. What color do you get when you mix cyan and magenta (pink)? Blue 3. As you add more colors, does the resulting color get lighter or darker? It gets darker. Gizmo Warm-up: Mixing Light 1. Observe the three primary colors of light. What are they? Green, blue, red. 2. You can click on the lights to turn them on or off. What colors are formed by the following light combinations? Red and green light: Yellow Green and blue light: Cyan Red and blue light: Magenta Red, green, and blue light: White 3. As you add more colors of light, does the resulting color get lighter or darker? Lighter. 4. How is mixing the primary colors of light different from mixing the primary colors of pigment (paint) Mixing the primary colors of light results in the primary colors of pigment. Activity A: Absorption and Transmission - Get the gizmo ready: Turn all 3 lights on. 1. Observe: Drag each shade of colored glass into the light box, one at a time. What do you notice? The color keeps getting darker and darker. 2. Predict: What color of light will be transmitted by the Dark red, thick glass? Red will be transmitted. 3. Experiment: For each glass color, turn on the red, green, and blue lights separately. Record the color that results from each combination of glass and light. Glass Red light only Green light only Blue light only Dark red, thick Red Dark green Indigo Dark green, thick Magenta Green Indigo Dark blue, thick Magenta Dark Green Blue Analyze: If a color of light passed through a piece of glass, it was transmitted. If most of the light was blocked by the glass, it was absorbed. Fill in the blanks below. A. Red glass transmits red light and absorbs green and blue light. B. Green glass transmits green light and absorbs blue and red light. C. Blue glass transmits blue light and absorbs green and red light. Activity B: Making Colors - Get the gizmo ready. Turn all three lights on. Remove all glass from the light box. 1. Challenge: Experiment with different combinations of lights and pieces of glass. See what colors you can create! Use the R G B graph to see that each colors matches the goal. (Hint: You don’t have to start with all three lights on.) Challenge Solution Color R G B Lights used Glass used Orange 100 50 0 Red and green 2 Light red thick glasses Deep purple 70 0 70 Red and blue 2 Light green thin glasses 50 25 0 Red and green 2 thick Light green glasses 4 Light red thick glasses 0 50 50 Green and blue 2 Light red thick glasses Brown Sea foam