I purchased a set of Carbon inks and carts in late March/April 2012 and a few months after that I started printing with a split tone of K7N and Carbon Inks in my Epson 7800.
I had K7 Neutral in 1(K), 7(Y), 6(LK) and 5(LM) and had Carbon in shades 2,3 & 4.
The set printed well until I decided last week to switch to all Carbon inks. I replaced the K7N carts with the Carbon carts (that I filled in April 2012) that had never been used.
I did gently shake the carts before inserting them into the machine. Performed two power cleanings.
Highlight transitions (compared to a print made before the cart swap) were now very abrupt - density seemed to slightly increase before it transitioned to lighter tonality.
Eventually performed a third power clean but the highlight transitions were still off.
Replaced the Carbon shade 7 with the old K7N - shade 7. Performed a power cleaning and the highlight transitions improved significantly.
Before I return the other K7N carts to the printer I have two questions:
- How much shaking is needed to return the old ink into suspension?
- Is there a point at which ink is just too old to return fully into suspension?
My ultimate goal is to print Carbon inks on both matte and glossy paper (after switching to opaque shade 1 photo black ink.)
Thank you for the help!