We did a sink and float water lab today.
First the students predicted what each object would do,
then they put it into the water and circled what it really did.
Next we used a black marker to make a line on a coffee filter.
We put a couple of drops of water at the tip of the filter and watched it spread.
When the water spread to the black line, the color of the line showed orange, blue, and brown.
The official term for this is chromatography ~ using water to separate soluble materials.
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