|Figure 1. A page with some color|
strips under a table lamp. Click the
image to enlarge it to see the details.
Use your word processor to draw and print some strips in any color you want on a page, as shown in Figure 1. Put the page under a table lamp (or sunlight) and let the light shine on it for 10 seconds. Then aim an IR camera at the paper. Figure 2 shows the results.
|Figure 2. An IR image showing the|
amount of light energy absorbed by
the color strips.
I have to admit that I didn't know how other colors absorb light energy before doing this experiment. With an IR camera, you can easily check it out just on your own like what I did--for any color and any comparison.
If you have heard that Steve Chu, our Energy Secretary, has been serious about advising people to paint their roofs with light colors and Mayor Michael Bloomberg has agreed to answer the call in New York City, you may find this little experiment worth your while--you may pick a color that does not absorb a lot of energy yet it will be more colorful than white.
Updates in 2013: Links to my YouTube videos about this experiment: