What color is Blueprint, Apartment house, Rue Heine, Plan des Caves, 1925 ?

Source Crayola® CSS3 CSS4
#547494
 
#4a646c
deep space sparkle
#708090
slate gray
#708090
slategrey
#8ca1ad
 
#979aaa
manatee
#a9a9a9
dark gray
#a9a9a9
darkgrey