For those of you looking to write on your harnesses, you'll want to take a look at some of these guidelines before you write your next novel on the shoulder strap.
This is a common question asked about harnesses. And my first answer is this. What happened to the inspection tags on your harness? Most if not all harnesses come with an inspection tag for you to log your inspections, and that should be the first place to look if you need to add some extra labeling or verbiage to your harness.
If the tag never existed or has been lost to the ages….
Miller approves the "Sharpie" brand of felt tip makers because the permanent ink will not cause deterioration. But that's it. If you want to use some other marker, you could send it in to have it lab tested… Seriously, just buy a Sharpie brand marker. Even if you've used some other brand marker since second grade.
So, as long as you are using a Sharpie brand marker you should be okay. However, you must always follow the manufacturer's instructions when it comes to issues like this. If you have a question, let us know and we'll hunt down the answer for you.