We were thrilled to have Mr. G visit again so soon! And he did not disappoint.
Our experiment: What Color Am I?
Trace the outline of a quarter with a green marker onto the center of a coffee filter. Stretch the coffee filter over the opening of a coffee cup. Dip your finger in water and hold it in the center of your circle for 5 seconds. Repeat that step. Hold the coffee filter in place and watch for 2 minutes! Do the experiment with black if you have time. Don't forget to hypothesize.
quarter green markers water coffee filter big cup small cup paper towel
1. The filter paper will hold the water in place. (1)
2. The green color will change to blue and yellow. (5)
3. The color will totally disappear. (3)
4. The green will change to black. (9)
The ring turned yellow and blue. This is because green is made up of the primary colors yellow and blue. When the colors get wet they move at different speeds through the filter paper. Blue moves the fastest and rushes to the outside. Yellow moves the slowest and stays in the middle. With black the ring become brown, blue, and a little yellow. The brown is red-ish so black is made up of all the primary colors put together.