What color is Unknown ?

Source Crayola® CSS3 CSS4
#6e8b98
 
#95918c
gray
#778899
light slate grey
#778899
lightslategrey
#ada685
 
#95918c
gray
#bc8f8f
rosy brown
#bc8f8f
rosybrown
#4e5045
 
#414a4c
outer space
#2f4f4f
dark slate gray
#2f4f4f
darkslategrey
#7e765f
 
#8a795d
shadow
#696969
dim grey
#696969
dimgrey
#636f5f
 
#757575
sonic silver
#696969
dim grey
#696969
dimgrey