Quote Originally Posted by FotoRR View Post
Folks- Thanks for the suggestions. Yes, I have used the split printing method. For production work this method is time consuming-much on/off of switches. Sadly there doesn't seem to be a single method of producing various grades. Trial an error just to get in the "ballpark"! Too many choices with not a lot of direction.
Brightening the green light will darken highlights and brightening the blue light will darken shadows. You don't need to know the "Grades" to use it.

But, if you want to use it like a dichroic head to simulate the individual Ilford MG filters (which all print with the same exposure) you can calibrate it as demonstrated here: http://www.jbhphoto.com/articles/vcc...ljbharlin1.pdf