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Moab Support Forum > Moab Juniper Baryta Rag 305 ink blotching issue on Canon Pro-1000

Moab Juniper Baryta Rag 305 ink blotching issue on Canon Pro-1000

I purchased a box of Moab Juniper Baryta Rag 305 (13 x 19) in Toronto.
I'm printing on a Canon Pro-1000 printer inside Photoshop CS 6 (Mac OS X 10.13.6)
While printing several different black and white photos I experienced an issue.

At one or two random places on the print, often in the upper half, and in only black areas, there would be ink blotches.
The blotches are very small, perhaps 1 mm across or less and they sit very slightly above the print surface.
This would not happen on consecutive prints of the same image but randomly on the 2nd or 4th or 5th print of the same image. This also happened when printing 3 or 4 different but very similar black and white images.

I tried removing the extra ink with a razor but that removed all the ink in that area of the print leaving a white spot where there was no ink at all.

I called Canon Canada tech support and they guided me through various printer adjustments including:
- perform nozzle check test
- change the print head height
- turn off vacuum
- clean the paper before printing
- inside Print Studio Pro switch from using the Moab ICC paper profile to using PSP BxW setting.
- connect computer to printer via USB cable

Canon tech support were not sure but suspected the paper may be the source of the problem.

It should be noted all the photos on the prints in question have a high proportion of black in the image. The photos are of musicians performing on stage with the performer in a bright spot light and the rest of the image is all black. The ratio is probably 60-70 % black and 30-40 % grey/white.
The blacks have all been reduced to 0 in photoshop so there is much clipping in the background black area.

I examined a new unprinted sheet of Juniper Baryta Rag paper under a UV light prior to printing and noticed a few very small (~1 mm or less) spot areas that were yellowish/white or light blueish white spots can be seen. Most spots are very small, less than 1 mm across. The rest of the surface of the paper has a very slight magenta tint under the UV light.

I can't tell if the areas that experienced ink splotching might correlate with the type of spots I saw under UV light on one sheet of paper, since I didn't think to use a UV light until after all the photos described above had been printed.

I have not had this ink blotching problem with other papers, but I haven't owned the printer for a long time.
I may not have a complete understanding of the numerous printer settings.

My questions are:
1) Could the print problem described above be due to an imperfection or bad batch of paper?
2) Or is the issue more likely related to a printer setting, or printer issue?
3) Or does printing an image with so much black pose special challenges for the printer/paper?
And a side question:
4) I've never looked at my unprinted photo inkjet paper under UV light before and I went on to see most papers I have (Hahnemuhle, Canson, Ilford etc) do have a slight magenta tint to them under UV light. A few papers such as Canon Luster and Canson Baryta Photographic do not show any magenta tint to them under UV light, unprinted on, straight out of a new box.
I'm curious why many inkjet papers have this color tint under a UV light, is it related to the type of paper?

Any help would be very appreciated.

Edwin

September 4, 2019 | Unregistered CommenterEdwin

Edwin,
Thanks for trying the Juniper Baryta, and sorry you've had some print issues. My assumption is that the high percentage of 100% black is causing a bit of over-inking when printing. The media setting of Photo Paper Pro Platinum is what we recommend to go with our profile, but it is also the media setting in the PRO-1000 which lays down the highest amount of ink. For your images, I would suggest making a test print or two using Photo Paper Plus Semi-gloss, which should apply slightly less ink, and likely eliminate the blotches you're seeing.

I have never inspected the surface of Juniper under UV light before printing, so I can't speculate as to whether the spots appear before printing.

As to the color of paper under UV light, papers which do not contain optical brighteners (OBA) will appear purple/magenta under UV light. Papers which do contain OBAs (in small or large amounts) will glow a bright blue under UV light, which makes them look whiter under full-spectrum lighting.

September 9, 2019 | Unregistered CommenterMoab Paper Support