Colors | Book Illustration, Relais: quinze planches donnant quarante-deux motifs décoratifs (Relay: fifteen plates giving forty-two decorative motifs), Geometric designs, plate 13 | Objects | Collection of Cooper Hewitt, Smithsonian Design Museum

Source	Crayola®	CSS3	CSS4
#48418e	#58427c cyber grape	#483d8b dark slate blue	#483d8b darkslateblue
#3b3a4c	#414a4c outer space	#2f4f4f dark slate gray	#2f4f4f darkslategrey
#d8d7ee	#c5d0e6 periwinkle	#dcdcdc gainsboro	#dcdcdc gainsboro
#6c7091	#757575 sonic silver	#708090 slate gray	#708090 slategrey
#adaab8	#b0b7c6 cadet blue	#a9a9a9 dark gray	#a9a9a9 darkgrey

What color is Book Illustration, Relais: quinze planches donnant quarante-deux motifs décoratifs (Relay: fifteen plates giving forty-two decorative motifs), Geometric designs, plate 13 ?