Yep, I'm a Yank! I'm guessing you must a relative youngster or you probably would recognize the reference. Back in the Stone Age[late 60s, early 70s] LSD was dosed occasionally on sugar cubes. A carefully measured dose, remember we are talking micrograms here, was pipetted on sugar cubes. One of the famous "brands" was called blue dot. It was also done on sheets of construction paper divided into 1/2 inch squares on which the acid was placed. A lot of times each of the squares was imprinted with some character or trademark. A very famous one of these was called "Mr. Natural" as each square was stamped with a drawing of R. Crumb's comic book character Mr. Natural. I realize you guys in the UK may not of heard of this.......I keep forgetting the international aspect of AFN. However, in this case, I believe its more of an age related thing.........Sorry for the confusion!!