Using Rosco filters for Multi-grade printing??

[EdWorkman]

I can't split the exposure- my enlarger is not sufficiently rigid- non stock mount to fit into a ceiling recess for big prints, which also means the filter drawer is inaccessible and out of reach.
So the plus geen/minus green is my solution one exposure.
The fractional saturations make it easy to refine contrast and multiple sheets can be stacked to get say 2 3/4 green .
I see fractions down to 1/8 are now available, probably that much refinement is beyond my capabilities.

[Andrew O'Neill]

I split grade print with a blue and a green roscoe filter. They go above the negative (8x10). They have worked very well for me.

[Steve Sherman]

I have used the Roscoe Gels "above" the negative stage for years to effect contrast with multigrade papers. I use a deep blue # 68 and mid green # 389 for split printing. The method I have been taught and has become accepted by the masters is to use only the blue / green method rather than trying to find a mid point as using the extremes is much more friendly to the mid tones, surely the most difficult component of the print to control.

Recently I acquired a Ilford 500 Head which uses a blue / green form of contrast control and can report that the Roscoe gels on my old Beseler 45 can produce equal extremes of contrast as the Ilford head.

Lastly, the blue / green method is additive in nature there by reducing printing times whereas magenta filters are subtractive and increase printing times.

2 cents, Cheers!