Liquid used in pens (3)
I believe the answer is:
ink
(Other definitions for ink that I've seen before include "Writing medium" , "See 9" , "Writing fluid" , "Printer's medium" , "Material used in printing" .)
I believe the answer is:
ink
(Other definitions for ink that I've seen before include "Writing medium" , "See 9" , "Writing fluid" , "Printer's medium" , "Material used in printing" .)