[mc32]

I'm no expert but in industry (and it may differ from company to company) coatings is mostly paints and inks are separate. Inks usually permeate (and add coloration to) a medium while coatings/paints bind and coat (to) a medium.

[jbay808]

Anodized aluminum forms a porous surface that is dyed with ink to colour it, if I recall correctly.