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LEDs offer flexible lighting that can change in intensity and colour.
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So called rainbow proteins (a spin-off from work into bioluminescence), which change colour in response to particular compounds, are also an option for detecting environmental toxins, or the potential agents of terrorism.
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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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For example, it is offering a service to mobile-phone companies in which subscribers can go online to change the shape, colour and other features of the case of their new phone.
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Roza Otunbayea, leader of the Ata-Jurt (Fatherland) movement, who was denied registration as a candidate, insists that yellow is the colour: it means ready for change, she says, as in a traffic light.
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He said that they thought it was the first time in the company's history that there had been a permanent change to the colour of the post boxes.
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That is because electronic paper does not need backlighting in the way that liquid-crystal displays do (see article) and making beads or capsules change colour does not take much energy.
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