@MES111 the higher contrast of your labels inspired me.
Bright yellow UV resistant paint over the stamped aluminum. Then the same “Sharpie Extreme” black ink in the impressions. Followed up by a clear UV resistant coat over it all.
Should be easy to spot because of the bright color, legible because of the contrast, and hopefully long lasting. Even if the clear, black, and yellow paint all wear off… It’s still stamped aluminum. They’ll possibly last longer than the tree…
