What color is Unknown ?

Source Crayola® CSS3 CSS4
#aec2c1
 
#b0b7c6
cadet blue
#c0c0c0
silver
#c0c0c0
silver
#8b8a7a
 
#95918c
gray
#808080
grey
#808080
grey
#abab9d
 
#979aaa
manatee
#a9a9a9
dark gray
#a9a9a9
darkgrey
#736c5e
 
#757575
sonic silver
#696969
dim grey
#696969
dimgrey