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When skin is blanched, it takes on a whitish appearance as blood flow to the region is prevented. This occurs during and is the basis of the physiologic test known as diascopy.[citation needed]
Blanching of the fingers is also one of the most clinically evident signs of Raynaud's phenomenon.[citation needed]
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blanching is prevented in gangrene as the red blood corpuscles are extravasated and impart red color to the gangenous part.
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