Black Marker Experiment
- white coffee filter
- black marker (not permanent)
Steps to Black Marker Experiment
- design the edge of the coffee filter
- roll the filter into a cone
- pour water into the bowl (doesn't have to be a lot)
- place the filter into the bowl with water in it
- observe what happens as the water travels up the filter
Questions to Ask the Children
- What are the colors of the rainbow?
- What do you think will happen when we place the filter into the water?
- What will happen when the water makes it to the black marker?
- Does one color move more quickly than the other? Why?
- How many colors do you see?
- Why does combining many colors of ink make black?
- Who would use this science? Why? (Biochemists)
Science Behind Black Marker Experiment
- Water separates the various pigments of the black ink
- The colors' speed depend on the size of the color molecule and how strongly the pigment is attracted to the paper
- Because the pigments have varying strengths and sizes, they separate when the water hits the black ink
- The science is called chromatography where a gas or liquid flows through a stationary substance
- The ingredients within the substance move at different rates
- Paint, for example, becomes a color by absorbing some of the colors in white light and reflecting other colors. Blue looks blue because it reflects the blue part of light and absorbs all other colors. When you mix many colors, each color added absorbs more light, leaving less light to reflect to your eye. So, when many colors are mixed together, we have black.
- Experiment with different colors
- Experiment with different types of markers
- Experiment with different types of paper