Steve,

I’m attaching my P900 quads that work well for these two papers. Try them and see if they work for you, but at the very least they will be a good starting point to print and run through QCDN again. I assume you’re using P700/P900.

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I do use more inks than you do, though. Your steps 10, 15, 20 are flatlined. If this were to happen I, too, do exactly as Richard suggested: manually adjust the numbers.

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I used to use 1- or 2-part profiles with all other printers (3800, 3880, P800) but for some reason when I got to the P900 it behaved differently so I’d get these plateaus or areas of flatness/posterization in palladium, BW, and cyanotype. Very frustrating. That’s what made me switch to using QCDN and 3 part profiles because I had no idea where to even start to introduce another part (Ron Reeder generally used 2 parts and I used 1 part when he and I co-wrote the book), although with lumen prints I only still use 1 part (K and Y only) because of the amount of ink necessary to hold back light for a day exposure.

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The other thing which may be heresy but I keep a slight “belly” (a Clay Harmon term) on my curves so they bowl down from the straight line slightly which works well with BW. A little more drama and darkness.

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Chris

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