Trouble
Cause
Solution
Pigment dissolves or breaks down in the fountain solution causing a light discoloration of the non-printing areas.

 




INK

Too low in viscosity to carry the pigment, varnish is not water resistant.

Pigment is hydrophilic and bleeds in water and alcohol.



 

Add a high viscosity varnish to the ink.

Reformulate ink with water and alcohol resistant pigments.

 

PAPER

Contain solustion is extracting an emulsifier or sensitizing agent from the paper coating.
Proof : substitution of another paper stops the tinting.

 

Replacement of paper.

  PRESS

Too much acid in fountain solution

 

Check PH of fountain solution and reduce acidity. Reduce amount of solution

 

 

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