The black hard rubber grips can change color if exposed to sunlight for long periods of time, possibly from someone displaying their pistol. The grip exposed will usually turn a brownish color. I've seen some that are almost tan.Another question relating to the grips. I have seen one of these Colts where one side had a black grip, and the other looks like it turned a greenish color. Same design of grip, just a color difference. Is it likely that one of these grips has been changed out at some point?