Abstract
What colour is a shadow? Black, grey, or some other colour? This article describes how touse a digital camera to test the hypothesis that a shadow under a clear blue sky has a bluetint. A white sheet of A4 paper was photographed in full sunlight and in shadowunder a clear blue sky. The images were analysed using a shareware programcalled ImageJ. The average red, green and blue pixel values in a region of interestdrawn on a photograph of the paper in sunlight and shadow were 0.3, 0.32, 0.38and 0.2, 0.3, 0.5 respectively, demonstrating that a shadow under a blue skyhas a blue tint. The experiment would be a useful exercise for a science class.
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