If Dennis Webb said they did in a book, Johnson et al paraphrased they did in a book, and I have found some in factory bags including a color combo previously not IDed as Heaton in any literature, I personally would tend to believe they made a few very simple opaque white based swirls. I can't positively ID Heaton swirl patterns even though I have a few hundred dug examples. I haven't spent enough time studying them. Maybe I should... a call to Jack would be helpful if he clearly remembers one way or another. Somebody at Bogard could have easily spent a day trying to make swirls that was forgotten too. People's memories about marble production are not always perfect.