What color is Envelope, Marres Center for Contemporary Culture Envelope, 2007–11 ?

Source Crayola® CSS3 CSS4
#444247
 
#414a4c
outer space
#2f4f4f
dark slate gray
#2f4f4f
darkslategrey
#636169
 
#6e5160
eggplant
#696969
dim grey
#696969
dimgrey
#908f99
 
#95918c
gray
#778899
light slate grey
#778899
lightslategrey