Bizarre ink 673 ink performance on L850 and L1800

[AmaDeuSbg]

Hello again,

Been around for quite some time wondering if to change the L1800 original 673 inks to the T54C inks. Because I nearly depleted the T673 inks in the printer I now decided to go for it and order the T54C inks but just before that I noticed something bizarre. Although the L1800 and L850 use the same 637 ink (L850 is like L800/L805 but with a scanner unit), the ink density especially on the black is different (worse on the L1800) when printed (for example on glossy paper no color correction applied on the same paper media). At first I was baffled and went to a local Epson dealer where we also tested this and strangely the machines there performed the same way.

This made me wonder if the driver for the L1800 mixes the inks for black in a different way compared to the L850 and thus even if I swap the inks with the T54C if it will be a better result and will be worth it or just to leave it and go for a new L8550

Any thought on this bizarre behavior on the inks on the two different printers is much appreciated, thank you!

Have a lovely day

 

[Ink stained Fingers]

Some color measurement of black patches - e.g. running a patch sheet for icc profile generation - would help very much; I'm not clear why inks would be mixed for black; I don't see a reason that inks get mixed to black since there is a dye black ink in the inkset.

 

[AmaDeuSbg]

Thank you, I will print both matte and glossy icc profile charts and tomorrow morning measure the lab values but visibly the black is much leaker on the L1800.

I do not now if the inks are mixed, I am just puzzled and trying to wrap my head around this - first thing that came to mind is either they are mixed and the mix ratio is different or the ink amount that the printer outputs is different on the L1800 vs L805).