Ages: 6-8
Less than 30 minutes
Grownup needed
Let's do colour 'subtraction'! Watch as water breaks down one colour into many, carrying pigments across paper to create magical colour transformations! Then turn them into beautiful colourful butterflies to add a touch of spring to your home.
Unfold the coffee filter paper.
Using a watercolour pen, draw a thick circle on the coffee filter paper, being careful not to tear it.
Then fold the coffee filter paper in half twice.
Place the folded coffee filter paper in the Mason jar with water. The bottom of the filter should barely touch the water. Wait patiently for 15 minutes. What changes do you notice in the coffee filter?
Repeat these steps to create coffee filters in different colours. Remove the coloured filters and let them dry.
Fold the dried coffee filters as shown in the picture, then spread out both ends. These will be the butterfly's wings.
Tie a pipe cleaner around the centre of the filter paper and trim off any excess. Follow steps 6-7 to turn the remaining coffee filters into butterflies.
Your filter paper butterflies are now complete. Try combining different coloured watercolour pens on the filters and observe what happens after soaking!
This is an example of 'capillary action'. Water moves along the coffee filter fibres, carrying the colours with it as it spreads. Because different pigment molecules are different sizes, they spread at different rates, creating beautiful gradient effects that look like colourful butterfly wings!