What color is Buttons (USA), late 19th century ?

Source Crayola® CSS3 CSS4
#494a3e
 
#414a4c
outer space
#2f4f4f
dark slate gray
#2f4f4f
darkslategrey
#352c21
 
#414a4c
outer space
#2f4f4f
dark slate gray
#2f4f4f
darkslategrey
#584427
 
#714b23
raw umber
#556b2f
dark olive green
#556b2f
darkolivegreen
#896a2f
 
#9c7c38
metallic sunburst
#a0522d
sienna
#a0522d
sienna
#666443
 
#6e5160
eggplant
#556b2f
dark olive green
#556b2f
darkolivegreen