Experiment 5

Objective: To extract the hidden colors that make up the main colors of various felt-tipped markers

Introduction:

This fun experiment allows us to discover which colors have been combined to create the various hues of felt-tipped markers. By using a simple technique with coffee filter paper and water, we can separate the individual colors that make up the ink in washable markers.

Required Materials:

●       Several felt-tipped markers of various colors (washable, water-based markers—no permanent markers like Sharpies)

●       Coffee filter paper (dry)

●       Short drinking glass

●       Water

●       Scissors

●       Ruler

Procedure:

1.    Add approximately 1/2 inch of water to the bottom of the glass. Measure the level using a ruler.

2.    Cut the coffee filter paper into long strips, about 1 inch wide. The number of strips should match the number of markers being tested.

3.    Color a dot about 1 inch from the bottom of each strip using one marker per strip. Use a ruler for accuracy.

4.    Place one strip into the glass at a slight angle, ensuring the water level is below the colored dot.

5.    Wait and observe as the water rises up the coffee filter strip, carrying the ink with it.

6.    As the water passes the colored dot, the ink will begin to separate into different colors.

7.    Repeat this process with the remaining markers and strips to see the hidden colors in each marker.

Observation:

Inks in most markers are actually mixtures of different colors. As water is absorbed by the filter paper, the colors separate and move at different rates, leaving behind streaks of varying hues. The paper will show these streaks once it dries, revealing the combination of colors used in the marker.

Questions:

1.    Why do you think Sharpies and other permanent markers won't work with this experiment? Sharpies and other permanent markers use a different type of ink that is not water-soluble, meaning the ink will not separate in water.

2.    When you conducted this experiment with your markers, did all of them expand and streak into various colors? If some markers did not separate, it may indicate that the ink is made from a single color rather than a mixture of several colors.

3.    If not, what does that tell you about the composition of the markers? It suggests that those markers may use a simpler ink formula, possibly containing fewer color components or a single dye.