I'm just putting new strings on my 5-string. Usually new strings are silver and used strings are a bit darker (some spots more than others), right? Usually I could see very well when the new g-string was on how much newer and brighter it looked compared to the old ones. Now the old strings sound a little dead but still have that bright silver look. the new g-string is much brighter in tone but has almost a coppery color. Anyone had this before? What's up with that?