Materials:

• Glass vessels – glass cup, graduated cylinder, etc
• Coffee filter
• Scissors
• Shish kabob skewers
• Water
• Colored markers – ideally include a few black markers from different companies

Process

1. Cut the coffee filter into strips
2. About 1” from the bottom of the strip, put a dot using one of the markers
3. Skewer the strip at the top and hang over a glass of water
4. Hang the strip over the glass
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5. Carefully fill the glass with water until it just touches the bottom of the coffee filter strip.
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6. It will take a few minutes for the water to move up the strip. Once the water has finished moving up the strip, take the skewer and strip off the glass. Empty the glass of water, then place the strip and skewer back on the glass to dry.
7. Notice how different inks are made of different color combinations. Notice different inks carry different distances up the filter strip.