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Endurance Test Method
The test method in which the Ink is treated with fix quantity of
fountain solution to observe the effect on Tack.
In this test graph the sample is treated with 0.5ml/min
(adjustable) for 5 times and the 6th time it is treated with excess
of water.
Interpretation
The point where the inks comes in contact with water/fountain
solution is called the angle of acceptance. More the curve toward
the ordinate axis indicates better acceptance.
After the ink comes in contact with water the tack falls and then
it regains back its tack, now better ink indicates how fast the ink
regains its tack which is called the angle of recovery and it should
also be near the ordinate axis.
Now mathematically if all the areas under the curves are same
then the ink is said to be perfectly water balanced and will not
face any problem on the press.
Also during the water test when the ink is treated with excess of
water and then again the ink regains at the same angle of recovery
indicates that ink is perfectly water balanced.
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