What color is Photograph, Photograph of the Construction of a Mass-operational House Designed by Hector Guimard (No. 16) ?

Source Crayola® CSS3 CSS4
#2c2c2f
 
#414a4c
outer space
#2f4f4f
dark slate gray
#2f4f4f
darkslategrey
#524f44
 
#414a4c
outer space
#556b2f
dark olive green
#556b2f
darkolivegreen
#706b5c
 
#6e5160
eggplant
#696969
dim grey
#696969
dimgrey