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I use these to mark details on DVDs and such as days of week on the metallized film that medications are encapsulated in. They are less suitable for plastic plant markers, as the ink seems to fade in sunlight over time.
I wanted a fine tip permanent marker for marking locations on clean metal. These are ideal and the amrk stays put unless subject to abrasion. The ink also helps stopping solder adhering to the metal where it's not wanted. An unusual use but I thought it may be helpful to someone!