What color is Birdcage in the Form of the Rialto Bridge Birdcage ?

Source Crayola® CSS3 CSS4
#313028
 
#414a4c
outer space
#2f4f4f
dark slate gray
#2f4f4f
darkslategrey
#4f5244
 
#414a4c
outer space
#556b2f
dark olive green
#556b2f
darkolivegreen
#6b6d63
 
#757575
sonic silver
#696969
dim grey
#696969
dimgrey