Indeed, you have the opposite problem to Mr Tinsley!
I can't believe this, within the same week, two posters have confused engineers blue for different purposes!
The stuff you want is layout ink, not the marking paste, that's used to find contact points on metal and scraping.
You can get it in a bottle or spray. Failing that a whiteboard marker will do for most jobs.
Don't throw it out though, it's still useful! Just not for what you want 
Michael W
Edited By Michael-w on 19/05/2017 07:52:11