“Cadmium Deep Red Hue.”
I would not recommend travelling with any paints or painted items, as most all paints are metal-based, as you have experienced.
That stuff has real cadmium in it.
I would have loved to have seen that Kodak moment from the baggage checkers..
My pocket knife is Dark Red and I can't fly with that. It must be a conspiracy against Red! I bet Blue dosen't have the same problems.
But then...
"Red skies at night sailors delight" We must all go to sea where it is safe!
All this and I don't drink coffee!