Doctored pictures... very possible but it would seem after reading all the feedback that someone would comment on where did the patina go?
I have a link here for you about tint, that also happens to be about this same seller.
You'll see a can of tint we use for tweaking paint and stain colors.
Many different methods used to apply, Air brushing being the easiest if thinned correctly.
Many more tips I'd rather not get in to.

FWIW,
Charlie

https://www.milsurps.com/showthread.php?t=22256