Acid has for many years worn 酸 (Acid in japanese) on his tights but since the team began, Acid II has began wearing 体験 (Experience) also, this has also become part of their entrance.
Neither worker has been seen to speak on screen.
Their logo and finisher name are clearly reference to LSD.
Just before Acid's contract came up there were plans for Acid II to begin to team with Enygma as The Mysterious Masked Men, a name referenced when all three appear on Team Global at USPW Born Enemies. The idea was dropped when Acid signed.