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

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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

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

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

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

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

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

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