What color is Drawing, Rocks off Grand Manan Island, Canada, ca. 1851–52 ?

Source Crayola® CSS3 CSS4
#7b767e
 
#757575
sonic silver
#808080
grey
#808080
grey
#906c55
 
#85754e
gold fusion
#696969
dim grey
#696969
dimgrey
#58332b
 
#714b23
raw umber
#556b2f
dark olive green
#556b2f
darkolivegreen
#4d4948
 
#414a4c
outer space
#2f4f4f
dark slate gray
#2f4f4f
darkslategrey
#bca788
 
#cd9575
antique brass
#bc8f8f
rosy brown
#bc8f8f
rosybrown