What color is Book Illustration, Karl Gerstner: Color Sound 15, Color pattern ?

Source Crayola® CSS3 CSS4
#6459a6
 
#7851a9
royal purple
#6a5acd
slate blue
#6a5acd
slateblue
#313f4c
 
#414a4c
outer space
#2f4f4f
dark slate gray
#2f4f4f
darkslategrey
#343a61
 
#414a4c
outer space
#2f4f4f
dark slate gray
#2f4f4f
darkslategrey