In reply to Alpenglow:
Just had a response through from Edelrid:
This is a question that appears every now and then. The stiffness comes only from the ink, a certain amount of ink is simply necessary to make the marking last.
We made tests with other markings and also we researched if there could be a handling risk caused by the stiffness but with negative result. (We had some ropes in validation that had random marks all over and but no problematic effect. Also the ink does not reduce the amount of dynamic EN 892 – falls, even if you place the mark on the edge).
Hopefully that allays any fears you might have had