Why do not shadows have any colour?

A shadow is the result of some of the light in an environment not reaching a part of it. Depending on how many sources of light there are in an environment, a shadow may have more or less light and be lit by more or less differently colored light sources. read more

Shadow doesn't have any colour. A shadow occurs when an object is in the path of light, effectively blocking it. So in the space occupied by the shadow, there's no light. Humans associate lack of light with darkness, which in turn is associated with the colour black. Hence, shadow is perceived as black. read more

As a painter and photographer, I do have to work from the practical standpoint that shadows do have color. It is the color of the material being cast upon plus any other light source. On a clear day outside a shadow will be a dark blue, because the sky is a giant diffuse light source. read more