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I refilled the hp 21 cart on my wife's hp 2210 printer with 5 ml pigmented blk ink. Blotted the head with a paper towel & did a head cleaning... everything looked great. Print is dark & not streaked. After 4 or 5 hrs of sitting, the print was very light, I cleaned the head & it looked good...

I have been having trouble with Canon PG-40 black cartridges...all have acted like the heads were plugged shortly after refilling them. Prior to being refilled, they all worked great, but were getting low on ink. These were OEM carts, so they hadn't exceeded their life expendency . With a little...

I have yet to encounter a clear cart, consequently I have been trying to figure out what the interior of a cart looks like. I have been filling PG-40s & CL-41s with pretty good luck. A picture of the interior of a cart & how it all works would explain a lot to me. Thanks, Roger

This is a very basic question, but I have read conflicting instructions. should the drilled refill hole be sealed or left open after refilling the cart ? Roger

I have several old HP cartridges which have been sitting around & are all dried out. How do you go about flushing them out ? Use distilled water ? Will soaking them over a long period of time clear the nozzels ? How can I tell if the little heating elements are burned out ? Any help will be...