We’ve been experiencing what seems to be a pigment settling issue with our Pro inks. We have been printing consistently (many times per week), but did not agitate our cartridges from the printer. Now we see a big hue (Cool tones are much cooler!) and overall density change in our prints, so our conclusion was that it must be due to pigment settling down.
We are soon going to refill the cartridges with new ink from new bottles we just ordered.
Should we discard the old ink remaining in the cartridges before adding new ink? Will old ‘settled’ ink contaminate the rest if mixed with new ink? Is it possible to dilute it, for example keep 10% of old ink and fill with 90% new ink, and do that everytime we refill cartridges to avoid throwing away what we have left?