Using ser to describe things that have changed My book says that ser is used for intrinsic things and things that do not change, like nationality or attributes or names. It also cites car color as an example, " Nuestro coche es azul" My question is, if this did change (if they repaint the car red, for example) then would estar be more appropriate? What about if you were talking about the old color, would you say "nuestro coche estaba azul"?