What color is Drawing, Piazza de' Cavalli in Piacenza ?

Source Crayola® CSS3 CSS4
#504e4a
 
#414a4c
outer space
#2f4f4f
dark slate gray
#2f4f4f
darkslategrey
#766b5f
 
#757575
sonic silver
#696969
dim grey
#696969
dimgrey
#b8ab96
 
#deaa88
tumbleweed
#a9a9a9
dark gray
#a9a9a9
darkgrey