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Since 1st March, 1999
 
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Ever wondered why butterflies and moths have powder on their wings' This powdery substance is actually a layer of coloured scales, which overlap each other. On touching their scales with fingers, the colour drains off, leaving the wings almost colourless. These scales are either filled with colour or grooved in closely, because of which they refract light, to give off shimmering colours even if any pigment is absent.

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