Halftone Problems

Well, it appears that I have chosen to showcase my relative inexperience with a contribution to the Vandercook bundle. Currently, I am having problems printing my second ever halftone. First of all, I think that I may need new rollers as these are a little glazed. I’ve used Putz pomade and a scotch brite pad on them. Might have to do that again. I’m using a thinish paper, Canson Ingres, with a laid texture. My ink is part unknown can and part Daniel Smith oil based relief ink. I am having trouble getting a solid black to appear. In the effort to get a solid, I have over-inked to where some areas of the halftone are gooping up. I’ve also got quite a bit of impression. Less impression does not deliver a passable solid at all. There are mystery particles in a kind of dirty halo effect around the heads, which I can’t seem to make disappear with the rag and typewash. I even used a toothbrush to make sure no lint was left on the cut. But still they are. I stopped printing, just unable to continue with this terrible result. I tried putting another two cuts to either side of the paper, just to give the cylinder more area to bear the weight, in case the concentration on the about 3 square inch cut was too much. I am using a drawsheet with a scrap of paper taped to it where the cut is, to give it a little softness. I think I am going to experiment with thicker dampened paper after this. Please take a look at the image, and see what possible solutions come to mind. Any help is appreciated.

sisters

Halftone Problems
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9 thoughts on “Halftone Problems

  • August 13, 2009 at 9:51 pm
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    Fritz,
    Thanks for all the info. That is good background to have. Helps me on my path, and maybe gets closer the the Path, no? (appealing to those Letterpress Gods)

    Julie

  • August 12, 2009 at 2:03 am
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    Wow, how far down the once well-travelled path of halftone printing we have come. Traditionally, halftones are printed on coated or super calendared stock, and remember, many of the Vandercooks were used by photoengravers to proof halftones, and 120 and 133 line screens were regularly used in commercial work. Halftone ink was once available from ink makers–it is a softer, not stiffer ink. The same result can be had by adding very small amounts of tack reducer, or even a drop or two of kerosene worked into the ink. Then there is this elusive thing called makeready, and the basic texts describe the process in detail, but on a Vandercook, a prime attribute was that makeready was not often needed.

    I still print halftones and I prefer 120 line ones, but I print on coated stock, as the letterpress gods intended such things to be, and use a Miehle Vertical. But I get fine results on our SP-15 from metal or photopolymer. Trying to do halftones on laid finish paper is, well, not Kosher.

    Fritz

  • August 8, 2009 at 8:06 pm
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    I ended up going even darker and letting the “chirascuro” effect happen with a good solid black. I added corn starch to the ink to thicken it since I didn’t have any magnesium carbonate handy. It seemed to help, but then, it was also humid and the paper could have been agreeably dampish and provided an accepting surface. And today’s run of text was pretty good, though I walked a fine line of too much ink.
    Mike, I will definitely be doing halftomes in the future on smooth paper. Thanks for your comments.

  • August 7, 2009 at 2:37 pm
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    I am curious. Smooth paper is easier to print a halftone on but did you try less ink and printing damp. We have printed 100 line of our platen, the smoother the paper, the better it prints. Laid finish is a challenge even with type.

    Good luck and keep investigating per Paul’s advise.

  • August 7, 2009 at 7:25 am
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    The packing on the cylinder is that yellow tympan paper and a mylar sheet. Perhaps I should not have a drawsheet of the same paper as the print, maybe too soft?
    Is magnesium carbonate available in any stores? I’m not sure I have time for anything to be shipped.

    I kind of doubt the fibers are coming from the paper, I bet it’s the rag, which is just an old tee shirt. Have to pick up those red shop rags along with the compressed air.

    The halo effect should be there-just not the particles! I like the idea that they are ghostly-this is a history of the press, kind of like Barbara‘s, and the ladies were instrumental in donating the press at one point-and they are gone now.
    Julie

  • August 7, 2009 at 7:08 am
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    Roni is correct, 85 lines is a good line screen. I do on occasion use 100 on a very smooth or calendered sheet.

    But I also agree with Barbara: build a hard packing and try a stiffer ink or add magnesium carbonate to the one you have. Certain papers, especially those made for printmaking, shed fibers on press, so frequent cleaning may be necessary.

    And I like the current effect too, a bit ghostly, it reminds me of a chiroscuro watermark were it a lighter color.

    Do continue to experiment, or to use Stanley Morison’s word: investigate.

  • August 7, 2009 at 7:00 am
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    Roni,
    The company that made the cut had said they use 85 screen, which I thought would work just fine. When I used less ink, I could not get the solid very dark. Was there more to your post? It ended in mid-sentence, after “is happening with your”.
    Barbara,
    Yes, next time smooth paper for sure. I can try adding some cornstarch to the relief ink, which was my next thought to try tonight, to make the ink stiffer. I noticed that the relief ink may need hard mixing as well. It was quite oily. I should pick up some compressed air and see if that helps. If I can get the ink to stick better, then I may be able to back off the impression. I should mention that I am also printing over a light white textured layer of ink.
    Thanks for the positive comment. You will be getting one of these, you know. I was impressed with your poem and print in general that was just posted here.
    Julie

  • August 6, 2009 at 11:00 pm
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    Hi Caveworks,

    I’ve only printed one halftone, but as I recall the plate needed to be cleaned and re-inked very frequently, and the cleaning needed to be followed by a generous blast of compressed air to get every speck of dust off. Also I think I used stiff ink, smooth paper, hard packing, and hardly any impression.

    Actually, I kinda like it the way it is. When I first saw the image — before I read about the problems — I thought, “Wow, that’s really cool!”

    Barbara

  • August 6, 2009 at 9:24 pm
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    I am curious what line screen you generated the halftone at. I usually make mine 85 line screens because it is coarse enough to keep them from clogging up with ink – which is what I suspect is happening with your

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