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Paper Chromatography

 

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Subject: 
Science
Art
Type: 
Activity Ideas
Demonstrations
Grade: 
K-2
3-5
6-8
9-12
What do I need?: 
  • Black marker
  • Paper clip
  • Filter paper: coffee filter, paper towel, tissue paper
  • Water
What do I do?: 
  1. Cut the filter paper of choice into rectangular pieces. The best size will fit into your cup without touching the inner sides of the cup.
  2. Using a black marker, place a dot or black line on the filter paper approximately 1 inch from the bottom of the string.
  3. Gently place the filter paper in the water. The sample dot/line should be above the water, not touching the water directly.
  4. Clip or tape the top end of the filter paper to the side of the cup.
  5. Wait one to two minutes for the ink to separate into different colors.
  6. Gently take out the filter paper and place it on a dry paper towel
Whats going on?: 

While we think of water as something essential for life; water does an incredibly good job at dissolving things, like salt and sugar. Any liquid that can dissolve things is called a solvent and water is considered to be the universal solvent.

Many black inks are a combination of different colored inks and not all black inks are made the same way. While water can dissolve the black inks, we need paper to more clearly separate the different colored inks. While the water is travelling up the paper, the black ink will start to dissolve and separate to more of its constituent colors.

Explore: 

1. Try out different colored makers to see a rainbow of results. 

2. Try out different types of papers, just make sure to ask permission.

3. Is blue (or any other color for that matter) just blue or is it made up of different colors?

4. You may find that some colored makers won’t separate no matter how long you live it in the water. Why do you think that is?

5. Have fun

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