What color is Unknown ?

Source Crayola® CSS3 CSS4
#829ca3
 
#979aaa
manatee
#778899
light slate grey
#778899
lightslategrey
#8c8876
 
#9f8170
beaver
#808080
grey
#808080
grey
#6d877c
 
#757575
sonic silver
#808080
grey
#808080
grey
#56665e
 
#4a646c
deep space sparkle
#696969
dim grey
#696969
dimgrey
#726758
 
#6e5160
eggplant
#696969
dim grey
#696969
dimgrey