Two years ago I created two curves that would allow UT14 ink to be printed on glossy paper. One printed a very neutral image and the other was a warm tone. Recently, I printed an image using the neutral tone and it came out surprisingly warm. I started digging into this and discovered I was very low on ink in several cartridges, so I refilled all of them and in some cases began using a "new" stock of ink that I purchased quite a while ago. The tone change persisted with the filled cartridges.
I printed a 6-color purge page to prove to myself that I didn't miss-fill the cartridges and it looks right - black then two gray stripes and then two warm tone stripes.
I have scanned an old test image and a test image printed tonight. Both are on RR Arctic Polar Gloss paper. Both have the curve UT14_Gloss_Neutral-2.acv applied. Both were printed with printer controls, gamma 2.2. To really see the difference, you may need to open this file, http://1drv.ms/1FLVQyT, in Photoshop. Looking at it with Windows Media Viewer does not really show the difference.
I am seeing this tone shift on all glossy papers. It is bad enough that I really can't consider my neutral curve to be printing a neutral image, though it always did before.
What could I be missing that would cause a sudden change in the tonality of my printing?