What color is Photograph, Photograph of the Construction of a Mass-operational House Designed by Hector Guimard (No. 32) ?

Source Crayola® CSS3 CSS4
#c1bdb4
 
#cdc5c2
silver
#c0c0c0
silver
#c0c0c0
silver
#757061
 
#757575
sonic silver
#696969
dim grey
#696969
dimgrey
#535045
 
#414a4c
outer space
#556b2f
dark olive green
#556b2f
darkolivegreen
#34332f
 
#414a4c
outer space
#2f4f4f
dark slate gray
#2f4f4f
darkslategrey