Is that evidence for or against the motion?
That's like trak pearls - once they get dirty, indexing is a little vague.Jagwire Elite Link cable housings are alloy beads that go over a Teflon tube. They come in various anodized colors. You could actually makes some strobed cables with those. I did black and silver on my bike because it's black and silver. It makes it obvious that I don't have hydraulic disc brakes.
But they are kind of pricey.