I've had my piezography setup going for a couple of weeks now, and after some initial setup hiccups the prints were looking great. Until a couple of days ago. I printed out a 12x18 image and it came out really washed out and flat in the shadows. I printed a nozzle check pattern and it looked clean, but I didn't have more time to deal with it then.
Tonight I printed the same image on a different paper but got the same flat shadows. I went back to one of the Northlight test images I used when first getting set up and something has clearly gone wrong. I printed a gradient step image and 80, 85, and 90 are all nearly the same shade, and 95 is WAY brighter than 100.
I took a closer look at the nozzle check and noticed that the Shade 2 ink appears to be about the same darkness as the Shade 4. I can see separation between all the other shades so this seems like the source of my problems. I haven't added ink to any of the carts since initial setup, and it was working fine until a few days ago. And, the nozzle check looks clean, it's just that Shade 2 is not very dark.
Any ideas what might have happened, or what else I should check?