Answer:

indelible

Answer	Crossword Clue
INDELIBLE	That cannot be forgotten
INDELIBLE	Ink choice
INDELIBLE	Permanent.

INDELIBLE	Like some pencils.
INDELIBLE	Like some ink
INDELIBLE	Unerasable, as ink

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.