acer-bee

hi guys i sometimes use the other end of my rope 2 climb and would like to paint\spraypaint or dip the rope 2 identify which end is which without comprimisng the integrity or erode the rope ,should i use chalk or what????????? its a xtc mint green 16 0r 17 mil???general size climbing rope ,cud b 19 not sure any feed back is woulfd be gratefull??????