On the "Contrast Control" fact sheet for Ilford multigrade papers, there are two methods of contrast control for colour heads: single filters and dual filters.
Under single filters, for Kodak filtration, Grade 00=199Y.
Under dual filters, for Kodak filtration, Grade 00=162Y/0M.
I don't get it. On my Devere head, dialing in only 199Y implies 0M, i.e., I set the magenta filter to 0. So, why when it is dual filters does this value change to 162Y even though magenta is still 0?
As usual, I hope this is not the stupidest question in the world for today.
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