Blackwork — solid black
Of the common techniques this is the one that ages best — provided it was drawn to age in the first place.
Solid black holds a lot of pigment in an even layer. When the skin stretches and the pigment shifts, the result is still solid black: a single line that shifts looks smudged, a field that shifts looks like a field. That is the whole difference.
What does change is the edges — the border between black and skin softens a little over the years. So a shape resting on a very sharp corner will read slightly less sharp a decade on, and a good design assumes that from the start rather than discovering it later.
