Opaque white

Discussion in 'Heidelberg Printing Presses' started by asem alsafady, Jul 8, 2018.

  1. asem alsafady

    asem alsafady Member

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    Amman Jordan
    Dear all,
    When we mix opaque white ink with other inks and print a proof everything is ok.
    After 24 hours the color become more yellowish, but the color of the sheets which we kept in a special folder for archiving still OK!!
    Any ideas or similar cases are appreciated.
    Thanks in advance.
     
    Last edited: Jul 9, 2018
  2. mantman

    mantman Senior Member

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    You did not mention WHAT paper you used -coated/uncoated/gloss?- If uncoated ink sets more deeply in paper thus your change of hue
     
  3. asem alsafady

    asem alsafady Member

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    Dear mantman
    Thanks for replying. We are using SPS cardboard (a box for midicine).
     
  4. mantman

    mantman Senior Member

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    Not familiar with it but try a small test: let one sheet in a drawer and one sheet out and measure both samples -not printed sheets- just to see if paper is affected by surrounding conditions. If you have a spectrophotometer read their Lab values too
     

  5. asem alsafady

    asem alsafady Member

    Joined:
    Mar 2016
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    Location:
    Amman Jordan
    Thanks mantman for replying.
    I'm too busy the next couple of days.
    I will try the test and send you the feedback.
     

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