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We stepped into Asia Crafts next door, where silver-tongued Kashmiris unrolled carpets that seemed to change colour every time they were turned upside-down.
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The Saint Lawrence, an almost constant by my side, seemed to change colour throughout the day, from choppy, muddy brown to a calm, silvery blue.
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The next stage, currently still in the laboratory, is to develop coatings that change colour when they absorb toxic chemicals, thus alerting soldiers that they are under chemical attack.
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