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How to refill the ink cartridge of hp deskjet 640C?

Hello,
I have this printer with me. Well honestly, I want to refill it myself. Is there anyway that i could make its ink myself first by mixing up some specific inks or by using an ink of a particular company? rather than buying the ink or refill package of hp.
well honestly, i want to go as cheap as i can get.
Thats why i want to do everything manually as cheap as i can get.

You have to be careful of what you use as ink. Some inks fade. Some stay sticky and when you put another thing on top of that page, it sticks. The sticky ink can also ruin your printer. Some office supply stores will give you a discount on your old ink when you buy a new ink, you have to ask because I don’t know which ones still do it. The one I take mine to is local and family owned. Plus you can check Ebay. I’ve bought ink online. Printer breaks down and they get stuck with the ink.

Here’s a link for you too:

http://www.refillinkcartridges.co.uk/HP_Guides/hp_deskjet_640c_colour_ink_cartridge_refill_instructions.html

How to Refill an Ink Cartridge