Obviously bearing in mind all children are different, when would you expect a child to be able to identify colours correctly? Would it make any difference if the child was developmentally 'ahead' in other areas (speech particularly)?
Trying to work out when I should get concerned that DD2 just can't seem to recognise her colours - she knows all the colour names, but when you ask her what colour something is she never gets it right (apart from pink for some reason!).