Do you need to re-mark your rope (maybe it needed cutting on one end) but are worried abouyt chemical damage to your climbing rope?
Beal has developed a special ink for marking ropes, in the middle as well as at the ends. This ink hardly stiffens the rope, is water resistant, and stands up to abrasion well.
NB! It does not affect polyamide.The container has a small roller at the tip for better inking.