What color is Drawing, Hotel (Façade Elevation with Two Interior Floor Plans), 1950s ?

Source Crayola® CSS3 CSS4
#767291
 
#757575
sonic silver
#708090
slate gray
#708090
slategrey
#9c9aa8
 
#979aaa
manatee
#a9a9a9
dark gray
#a9a9a9
darkgrey
#494267
 
#58427c
cyber grape
#483d8b
dark slate blue
#483d8b
darkslateblue