This procedure is what I stumbled upon with D-72 @ 48-1 plus 1 minum of glycerin per 6 oz. On arista ortho film--usually about 12 min 1 agitation every 2 min. What started me on using this developer on film was the old package that said Dectol D-72 film, plate, and paper developer, so I just had to try it. I adjusted the mix until the highlights came up in 1-2 minutes than developed until shadows were there. Easy to use as ortho can be developed under a red safelight.