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Colours separate because
smaller & lighter particles move faster and further than large heavy particles.

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We used coffee filters and different colours.

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The colour on paper spread with the 2 colours it was made of.

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1. Cut out several pieces of 2 by 15 cms strips of blotting paper.
2. Fold each piece in half halfway down, unfold it and draw a heavy felt tip pen line along the crease.
3. Repeat on several pieces of paper using different coloured felt pens.
4.Put the end of each strip in a bowl of water, you might have to raise the bowl to help the water soak down through the paper.
5.before the water seeps through the paper, guess what is going to happen.

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blotting paper
pencil
ruler
scissors
bowl of water
coloured
pencils

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I think it will change the colour of the water.

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How do colours come  apart?