CISS System Canon Pro 9000

[fracas1947]

Being a keen Club level photographer I have gone to a lot of trouble selecting the right paper and using the correct ICC profile and up to now using City Ink Express Inks have been quite successful.
The City ink Express CISS system has worked well after I designed and manufactured a proper carrier for the feed pipes.
I purchased a fresh supply of inks just after Christmas and refilled those bottles that were short ie photo magenta,photo cyan and yellow.
The results I got from then on we're appalling.Certain colours were lacking saturation and the blues in particular we're very dark. No adjustment to the original image in photoshop could rectify the problem.
When I carried out checks on the latest batch of refill bottles I found the photo magenta and photo cyan had different labels from the previous batch.The latest batch had "I9950" and the previous batch ahead "8 series". Does that make a difference, City Ink support will not tell me.
What they did say was that after 13 months of use all my previous inks in the tanks were out of date and would not mix with the refill inks.
My question is :- Are city Ink Express correct in their judgement and I unknowingly the looser by now having contaminated inks or have they previously sold me different spec inks and will not own up to it.

Any worthwhile comments would be gratefully received.

 

[BlackCloud]

I don't suppose by any chance you have mixed dye and pigment inks? Otherwise just sounds like they have either changed supplier or formula which is throwing your results off. Guess you have checked for a blocked head which may affect the mix of ink on paper?

Staing the obvious I know, but I use Epson and use Epson cartridges which obviously costs but it works for me and is consistent. No problem with mixing old and new.