Sorry for giving life to an old thread but I just can't seem to find the answer anywhere. I'm hoping someone will know. I's always bugged me. What is the blue-ish line that is in the middle of the centre links? It is on all the Tridor bands but I can't see the reason to why it's there. You can see it quite clearly in the photo below. Thanks.
$(KGrHqJHJCwE91G,siePBPe1C8ttO!~~60_3.jpg