I am actually not sure what you are asking.......probably just me ?!.
The use of different colours illuminated on the paper via the negative is what changes the contrast of the multigrade* paper from 0 (soft ) to 5 ( hard ) with grade 2 to 2.5 being the normal grade for printing a correctly exposed and processed negative. You do not have to worry, or indeed know anything regarding the actual colour of the filtrations used.
You dial in the grade and thats the grade the paper will print at.
Is that what you are asking?
* all MULTIGRADE type papers, generically known as Variable Contrast papers.
Simon. ILFORD Photo / HARMAN technology limited :