Has this ever happened to you? You’ve drawn a nice, colorful picture with felt-tip pens, and then the picture accidentally gets wet. The paper curls and the colors suddenly run. Strange – now you can see completely different colors. Where did they come from? Are there other colors hidden in the felt-tip pens?
Secret of colors
You will need
- Coffee filter
- Felt tip pens
- Two small bowls
Let’s get started!
1. Prepare paper strips
Cut a rectangular strip as long as possible from a filter paper.
2. Colorful felt-tip pen dots
Draw a line of dots on the strip using different colored felt-tip pens. The dots must be at least 0.5 cm apart. Fold the strip on both sides as shown in the photo.
3. Fill with water
Place the strip over two bowls so that one end extends into one bowl and the other end extends into the other bowl. Fill one bowl with enough water to wet the bottom of the strip.
Observe how the water is slowly absorbed by the filter paper. It moves through the paper into the second bowl. Be patient, it may take a little longer to see anything.