I am a newbie in Piezography and I am starting to print with K7 inks.
I ordered the kit from Inkjetmall and I configured it on my Epson 9900.
I print on Photo Rag but I noticed immediately that Shade 6 was a little pinkish. I thought that I had a problem, maybe a contamination with the red Piezo Flush so I cleaned the print head again. I also doubt about my lightening and metamerism so I went outside to see the appearance under a sunlight: shade 6 was still pink!
At that point I tried this: I put some ink drops of shades 5,6 and 7 directly from the ink bottles on a rag paper and the pinkish was in the inks. See the picture attached.
I re-measured the calibration target of shades 5, 6 and 7 and Lab values of shades 6 are very different from all the other ones.
This is an example of some measurements (A and B are referred to Lab). You can see that all shades (I just wrote 5, 6 and 7 but the other four inks are perfectly neutral) are neutral with a close to zero negative value in A channel and a positive value in the B channel. The Shade 6 ink is positive in A and B introducing a little magenta cast)
Shade 5 A B
-0,27 2,75 -0,28 2,56 -0,31 2,26 -0,34 2,02 -0,36 1,64
Shade 6 A B
2,50 2,31 2,40 2,28 2,26 2,20 2,02 2,04 1,79 1,77
Shade 7 A B
-0,62 2,30 -0,69 2,53 -0,75 2,72 -0,77 2,83 -0,74 2,77
Is it normal? Because I can see the pinkish cast in the light gradients ( I print on Hahnemühle Photo Rag 308 with the standard curve set) and it is also obvious on the printed target.
Thanks for any help.