What color is Drawing, Geometric Studies, for Hickok Belt Company, 1929–32 ?

Source Crayola® CSS3 CSS4
#27262b
 
#414a4c
outer space
#2f4f4f
dark slate gray
#2f4f4f
darkslategrey
#63bb7d
 
#71bc78
fern
#3cb371
medium sea green
#3cb371
mediumseagreen
#668f73
 
#757575
sonic silver
#808080
grey
#808080
grey