Pressman

Discussion in '1-Color and 2-Color Offset Presses' started by Artimusg, Oct 23, 2012.

  1. Artimusg

    Artimusg Member

    Joined:
    Oct 2012
    Messages:
    13
    Location:
    United States, Iowa
    We have been running into a challenge with our 4 color process building purple. It seems all other 4 color work we can run to standard densities. But when it comes to a,purple build we have to jack our magenta, and cyan around, sometimes 20 points off standard. Is this a possible tack issue between the I is? Any help wold be Great!
     
  2. fmcpherson

    fmcpherson New Member

    Joined:
    Jan 2014
    Messages:
    2
    Location:
    Chicago, IL USA
    purple trouble

    First off Purple is one of the most difficult colors to consistently hit. Even a 2-3% shift in density can noticeably change the color. K, C, M, Y should be the correct color order. This also sounds like it could be a calibration issue. Make sure that the RIP is providing the correct amount of dot gain. You would have to run a calibration test. What press are you running?
     
  3. ziggy33

    ziggy33 Senior Member

    Joined:
    Jul 2010
    Messages:
    451
    Location:
    Rice Lake WI
    What press are you running I can run purple all day no color bars, I would check your dot gain make sure its correct sounds like your gain is too low so your trying to make up for it by over inking

    Also there is no correct color order!
    its all on the operator I run KYMC sometimes its MCKY all depends on coverage
     
  4. DanRemaley

    DanRemaley Senior Member

    Joined:
    Oct 2010
    Messages:
    101
    Location:
    Pittsburgh, PA
    Actually there is a 'correct' color order - it's CMY black can be first or last. If you print MCY the "reds" will suffer, because of the cyan between M/Y.
    Purple is the hardest color to print because the C/M values are at or near 50% - right where the biggest change takes place on press.
    dan
     

  5. NotAGooner

    NotAGooner Senior Member

    Joined:
    Dec 2007
    Messages:
    279
    Location:
    UK
    Is it not possible to spot colour your purple, yes I know it's an extra colour but it might save you a lot of grief?
     
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