This is what Ansel called an ortho-panchromatic emulsion. It is more sensitive to green than most contemporary films, so it is superior for rendering foliage. I used to rate it at 12 and give it 9 minutes in Rodinal (1+100) at 70 degrees. I seem to recall that I also sometimes rated it at 40 and developed it in the Pyrocatechin Compensating Formula that Ansel gives in The Negative--developing time was in the vicinity of 15 to 20 minutes.