I like the autographs, they're classic examples. But it concerns me when the ink and the monochrome photo are the same color, and it's not black. What other info is there?
However there are also other examples I’ve seen where the signatures are all in black ink. Suffice to say the point you raise is a good one in the current forgery filled market. It is extremely difficult to say one way or the other without seeing it in person. Then you can see live ink vs photocopy, pressure points etc.You just can’t be too careful!!!