Long lasting permanent texts with a nice dark black finish. Always reliable and although a little more expensive its well worth it in this case

Artlibe, so a huge brand for permanent markers. Never fail to work. I use them to label freezer bags of food I store in the freezer. They’re great for labelling tge kids school items. Last for ages

These last for ages. I have had the last for over a year and it is still going strong. I use it to write on everything from the kids school gear to their swimming gear and it stays for a very long time.