Ink That Can't Be Erased
This page is the CodyCross answer for the clue below from Water Park, Group 749, Puzzle 4 (Indoor Zip Line).
Question is: Ink That Can't Be Erased
and the answer is: INDELIBLE
Word Meaning:
INDELIBLE — Having the quality of being difficult to delete, remove, wash away, blot out, or efface.
Definitions from Wiktionary.