I am a firm believer in either laser-printed or Brother P-Touch labels for my plants, but a lot of us like to hand-write stuff like dates of flowering or repotting, bloom stats, etc., on them.
I used to be able to get "Pilot Photographic Pens" (intended to write on prints) for a couple bucks each, and they were better even than the Sharpie Industrial markers. Unfortunately, they are no longer manufactured.
I contacted Pilot, and they sent me some samples of an "art pen" - labeled as "Pilot ultra fine point permanent type NO XYLENE SCA-UF". I wrote on a plastic label, and stuck it out in direct exposure to all-day sun and whatever Mother nature dumps on it.
After 3 months, I see absolutely no fading from the black ink. (The green was mostly gone in 3 weeks.)
I used to be able to get "Pilot Photographic Pens" (intended to write on prints) for a couple bucks each, and they were better even than the Sharpie Industrial markers. Unfortunately, they are no longer manufactured.
I contacted Pilot, and they sent me some samples of an "art pen" - labeled as "Pilot ultra fine point permanent type NO XYLENE SCA-UF". I wrote on a plastic label, and stuck it out in direct exposure to all-day sun and whatever Mother nature dumps on it.
After 3 months, I see absolutely no fading from the black ink. (The green was mostly gone in 3 weeks.)