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Thank you for all your attention to this and the help you have provided.

The cartridges I have are definitely Canon OEM. They have the Canon logo on both sides and on the top as in your scan, and the brown phenolic chip. Got them at B&H - at a price I would expect to pay for OEM.

I have appreciated all of your input and have learned some things about the iP8720. I am a novice concerning this technology as I am sure is obvious. Forgot to say that, yesterday I did take the photo black cartridge out and blew into the vent (the Y shaped opening) and nothing came out onto...

PeterBJ, I hadn't seen your reply until now. But since my last post I'd printed a couple of photos on photo paper which both came out very nice. I resolved to just not use plain paper. Then today, before seeing your post, I printed a photo on photo paper which had the vertical stripes again...

Maybe not...? When I said problem solved after installing the Canon cartridges, I had printed the same photo above (Venice gondolas) and it was fine. Today I printed a different photo, except used plain paper (for reasons not relevant here - I always use photo paper if I want a quality photo...

Received and installed Canon cartridges. Problem solved.

I appreciate your responses. I was prepared to be chastised about the cheap cartridges and take those comments to heart. But, hopefully the good news is that, when I scanned and uploaded the nozzle check I was not looking at it closely enough to realize it was not at all an accurate...

Here's a photo print that shows the vertical black gray stripes

Is this what you're referring to?

Been using after market ink tanks on my iP8720. First set worked fine. When they needed to be replaced, I replaced them with the same after market product. After replacing the tanks, prints were fine except blacks had vertical gray stripes. Did the nozzle cleaning with the print utility and...