What color is Book Illustration, Urformen der Kunst (Art Forms in Nature), Adiantum pedatum Haarfarn (Maidenhair fern) ?

Source Crayola® CSS3 CSS4
#dbd3c7
 
#dbd7d2
timberwolf
#d3d3d3
light gray
#d3d3d3
lightgrey
#66666d
 
#757575
sonic silver
#696969
dim grey
#696969
dimgrey
#44444c
 
#414a4c
outer space
#2f4f4f
dark slate gray
#2f4f4f
darkslategrey