Types/Escape.Sequence/backgroundBrightBlack.ps1

<#
.SYNOPSIS
    Background Bright Black Escape Sequence
.DESCRIPTION
    Escape Sequence to set Background to Bright Black
.NOTES
    This color is xterm color number 8
.LINK
    https://en.wikipedia.org/wiki/ANSI_escape_code
#>

$e = [char]27
"$e[100m"