What energy color to represent the void?

      What energy color to represent the void?

      ​Hi ..

      Simple question really, what is the defacto color you can choose that just screams to you this is the void energy color. I'm asked in redesigning my operator and i wanted my energy to look like its just pure void. What color would you consider that to be? I would be very thankful if you did what color pallet and where in pallet did i can find it.​

      Please help.

      I did not find the right solution from the internet.

      References: -
      bit.ly/2Ea2Xq0
      B2B Digital Advertising Campaign​

      Thanks!