Ya’ll won’t like this….
I mark my arrows with colored stripes, using electrical engineering color code (aka resistor code: black=0, brown=1, etc.). I use two colored stripes or a broad stripe with thin borders under the feathers to show the spine. Between feathers and nock I use stripes to show the arrow weight, not including the point. On the foreshaft, about halfway from crest to point, each arrow gets a single stripe or two stripes to show arrow number. It’s easy to notice during target practice if a certain arrow isn’t flying or grouping as well as the others.