Here is an example of how the medium changes the colour of an object.
As the object goes deeper into the water where the pressure of the water changes the colours change. The most dramatic change is with red and brown and black. Certain wavelengths are scattered differently so the colour of the objects change.
But this is the point. Is the colour changing? Is the colour in the object? Or is the light which reaches our eyes changing?
This is a good example of quality not being in the object. We must question what is consider inherent.