It might also be useful to distinguish the color green from the experience of that colour. Some philosophers (and scientistists, e.g. Galileo) have held that the color just is the experience, but it is m0re common and more plausible to distinguish them. Some would identify the colour with a disposition to produce the experience (which is distinct from experience itself, since it may be present in the dark), some would identify the colour with physical properties of the surfaces of objects, and there are other views as well. Anyway, if colour is say a property of surfaces to reflect light at certain frequencies, then this is something that can be explained to a blind person. But when it comes to the experience itself, it may well be that someone who has not had any visual experience is not in a position to have the full concept of color that the sighted have, and so not in a position to understand the experience as fully as the sighted can.
How would you explain the color green to a blind child?