1. Looking at Colors! Lesson 11 http://micro.magnet.fsu.edu/primer/java/scienceopticsu/light/subtractive.html

2. Spectroscope Materials  Cardboard tube (back middle table)  Black piece of construction paper with a square hole in it (back middle table)  Aluminum foil square (back left table)  Masking tape (back middle table)  Scissors (by door)  Diffraction grating square (In front – Mr. Abraham will distribute these)  Decorate your scope if you have time or desire.  Write your name and class period on your scope and turn it into the bin up front.

3. Where does color come from?

6. All the colors are absorbed by the pigment in the paint except the colors that make blue. The light bulb produces all the colors of white light. Why does a Smurf appear blue? Blue bounces off and hits your eyes. Why does a Smurf appear black through a red filter? Blue bounces off and is blocked by the red filter. No colors make it to your eyes.

7. Lesson 11 Big Ideas:  In order to get color you can take away color from the spectrum. (All the colors combine to make white light. In order to get color you need to take some color out of the spectrum.)  If you take out all the colors of the spectrum you get black. (From a physics standpoint, black is the absence of color and is not a color at all.)  Pigments, paint, ink, dyes, etc. all absorb some of the colors of the spectrum. The colors of the spectrum that are reflected blend to create the colors we see with our eyes.

8. Lesson 11 Big Ideas (Cont.):  Another way to take color from the spectrum is to use filters. A red filter will only allow the warm colors (ROY) to go through and block the cool colors (GBIV).  The primary colors of pigment (also called subtractive colors) are cyan, magenta and yellow.  You can blend the three primary pigment colors to make any color you have ever seen.  Examples of pigment colors are ink cartridges, test prints, comics under the microscope, etc.