regarding the black color, and the possibility of losing it, and putting a yellow line on it: I put strips of fluorescent yellow tape on a lot of my gear, for similar reasons. I also put glow in the dark paint on a lot of my gear, for similar reasons.
You could always paint it. On some of my equipment I put some of those tritium keychains on them. They’re not cheap, but they have some benefits over glow in the dark stuff. For one, they don’t need charged by light to work. You can also (barely) use them to see to read something if you had too. They could also be used to attract fish at night when fishing in an emergency.
