My blade sights look identical to the bead shown in the photograph, when there is a minimum of light from behind, as is normal.
Note the angle on the rear of this blade - Verner Rifle, Taylor's latest build. When held looking down range, it has a short 'glowing' section that shows up well on dark forms - like a deer's rib cage. On birght targets, one merely used felt pen or sight blackener, thumb-wiping it off or re-applying as needed when on a trail walk.
Bead angled back.
Bead glowing with extra light. Needs more filing, a bit crooked, yet. Brass rod soldered onto a narrow blade sight. A blade shows the light, likewise.