I've wondered about this and never got a straight answer - I've seen this condition on Gibson guitars in particular where the cherry red color of the back of the neck bleeds over or into the the white or ivory colored binding along the fretboard. Is this just sloppy painting on Gibsons part or is there something more insidious going on? For some reason it seems to be more prevalent at the headstock end of the neck. If it's just sloppy painting, I should be able to scrape or sand the reddish stuff off, no? But if it is truly something more insidious at work here . . . I recall reading something on the LP forum where people were convinced that it was some kind of a mysterious transfer of the red finish caused by the heat of the fretting hand, but that sounds more like voo-doo than science. I've heard of "hot" players, but that doesn't quite sound like a reasonable explanation. I know there are some experienced and informed finishers here, what do ya'all think? Best Regards, Geo.