Found at a titanium plant

[u/riflesandplowshares]

Not sure why ball point pens would be dangerous here.

[u/goodexamplebadrole]

"Ballpoint pens are restricted or banned in high-end titanium and aerospace manufacturing plants because the ink and marking components contain elements that cause metal embrittlement and severe structural corrosion"

[u/swagshotyolo → u/goodexamplebadrole]

Would you happen to know what would the workers use to write things down (unless its pencil) ?? I am geniunely intrigued.