Crossword Clue:

that cannot be seen

Answer	Crossword Clue
INDELIBLE	That cannot be forgotten
TRESS	Lock that cannot be opened
DRAFT	Call to arms (that cannot be denied).

HIDDENFLIES	Buzzers that can't be seen?
ROOTS	Parts that might be seen in parts
MID	Something that may be seen opening night?
OAR	Something that may be seen in a bank
ARARAT	Biblical mount that can be seen from three countries
IMAC	Apple that might be seen on a teacher's desk
ARNO	River that can be seen from the Uffizi Gallery
GREATBARRIERREEF	Only living thing that can be seen from outer space

INVISIBLEPATE	Chopped liver that has to be seen to be believed?
ACORNS	Items that can be seen on the back of a dime
ATEST	Event that could be seen as far away as Las Vegas in the '50s