under what circumstances red shadow can be formed

A SHADOW CAN BE FAINTLY FORMED BY A TRANSLUCENT MATERIAL AND SO IF THE MATERIAL IS RED, THE SHADOW CAN SLIGHTLY SHOW THE SIGNS OF RED IN IT. FOR EXAMPLE, IF YOU CAREFULLY LOOK AT THE SHADOW OF A PAINTED RED GLASS, YOU CAN SEE THE SHADOW AND THE RED IN IT FAINTLY.

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Shadow is always black.
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The red sheet absorb all other colours of white light only allowing red light to pass through it.
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If the material is painted red, shadow can show some signs of red color
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