Use "change colour" in a sentence

1. For a while they lay on their backs, catching their breath and watching the sky above them gradually change colour as the sun rose higher and higher

2. Leaves on the trees losing the bright freshness of previous months, starting to think of the coming autumn when they would harden off and change colour

3. September, soon harvest time would arrive and the leaves on the trees would start to change colour

4. light that could change colour by pressing of a key

5. tracking devices in his hat, you know, the ones that change colour when they

6. Just as this was happening, as if in response, the leaves of the trees began to change colour, signalling the beginning of autumn

7. He waited for the potassium chromate to change colour from orange to green as it reacted with the alcohol