What color is Blueprint, Apartment House, Rue Heine, Facade sur Rue, 1925 ?

Source Crayola® CSS3 CSS4
#628aac
 
#6699cc
blue gray
#5f9ea0
cadet blue
#5f9ea0
cadetblue
#8da5b7
 
#979aaa
manatee
#a9a9a9
dark gray
#a9a9a9
darkgrey