Sunday, February 27, 2011

Ghosting - Part 2 - Chemical Ghosts

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6 comments:

  1. Gordo, your illustration shows ink-film thickness to be about the same as the paper thickness. Isn't ink-film thickness actually a thousandth of paper thickness? I was told the cause of "chemical" (gloss) ghosting was because as the ink on the first side of the sheet dried it absorbed oxygen from the paper, causing different drying (and gloss differences) when the other side of the sheet was printed and there was an "unbalanced" drying of the second-side ink. The solution was to "wind" the press pile between printing the front and back to equalize the oxygen content of the paper. Is there anything to this "old wives tale"?

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  2. @Preston - Yes I show ink film thickness to be about the same as the paper thickness because if I drew them at their correct thickness relationships you wouldn't see the point that image was trying to communicate.
    It's not the oxygen that's causing the problem it's the gaseous by-products. Winding the sheets adds more air between, not within, the sheets.

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  3. Hi,

    @Gordon Thanks for using easy to follow images within this post.

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  4. Gordo, thanks for sharing this. I just got a question, what paper substance did you use to illustrate this idea?

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  5. @ Digital Printing Master. None. The image, as stated, is a graphic representation to illustrate the concept.

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  6. Very interesting, thanks for sharing.

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