In lots of War of the Roses era paintings the knights armour is very dark grey or black. Is this an example of the paint changing color over the years or was the artist depicting armour left black from the hammer?
And if the artists were trying to depict "black from the hammer" armour (and even if they weren't) would it have been as common as the paintings sometimes make it look? And since in these paintings all the knights are depicted in this way, would this mean that all ranks of society (or all that had armour) might have worn black from the hammer? Such as a lord or monarch, and not just the common men-at-arms?
Please forgive me if this has been covered somewhere else, I did a search but came up with nothing.
Here are some examples of what I'm talking about...



