What color is Poster, World Cities and the Future of the Metropoles ?

Source Crayola® CSS3 CSS4
#878079
 
#757575
sonic silver
#808080
grey
#808080
grey
#383834
 
#414a4c
outer space
#2f4f4f
dark slate gray
#2f4f4f
darkslategrey
#aaa5a0
 
#979aaa
manatee
#a9a9a9
dark gray
#a9a9a9
darkgrey
#69615a
 
#6e5160
eggplant
#696969
dim grey
#696969
dimgrey
#fff689
 
#fce883
yellow
#f0e68c
khaki
#f0e68c
khaki