Someone asked what the makers of Acutol showed that I said was impossible. In one of their blurbs, they showed what purported to be two characteristic curve shapes. The one depicting Acutol had a curve with its maximum slope at zero exposure, the slope decreasing as exposure increased until it became flat. It was a better approximation to the usual curve of CI vs log(exposure). Whoever did the blurb shouldn't have. The curve Acutol was supposed to be better than had a nice toe, a long straight line, and no shoulder.