What color is Blueprint, Apartment House, Rue Heine, Plan du 5e Etage ?

Source Crayola® CSS3 CSS4
#6081a2
 
#5d76cb
indigo
#708090
slate gray
#708090
slategrey
#90a4b4
 
#979aaa
manatee
#a9a9a9
dark gray
#a9a9a9
darkgrey