What color is Device, Optical (Germany), late 18th–early 19th century ?

Source Crayola® CSS3 CSS4
#2e2b25
 
#414a4c
outer space
#2f4f4f
dark slate gray
#2f4f4f
darkslategrey
#7b5d33
 
#714b23
raw umber
#a0522d
sienna
#a0522d
sienna
#4e4a3f
 
#414a4c
outer space
#2f4f4f
dark slate gray
#2f4f4f
darkslategrey
#573e20
 
#714b23
raw umber
#556b2f
dark olive green
#556b2f
darkolivegreen
#352211
 
#000000
black
#000000
black
#000000
black