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Summary: The packaging for an HP printer cartridge contains a self-posted green envelope that can be placed in the mail with a cartridge that can no longer be used. Consider recycling HP printer cartridges at schools or through the Red Cross with help from an employee of an ink-filling station in this free video on HP printer cartridges.
"Hi, this is Taylor. We're here talking about HP Cartridges and their printers. Today we're going to discuss how to recycle an HP Cartridge. Once you purchase an original HP Cartridge, inside the packaging they'll contain a self-posted envelope, usually green in color. Once you finished using your cartridge, place it in the bag, seal it and place in the mailbox. Now HP loves this because they receive the shells back, rework them and then sell them again. Typically the best thing is to reuse and refill your cartridges, thus, saving the environment and your, your pocket book. Other valuable solutions for your cartridges after you use them, many schools will accept them for credit for your students, which is always excellent. Also, many Red Cross locations will accept your old empty cartridges and they receive money for them; gives it a good contribution to the Red Cross. You can also take it into many of your local office supplies stores as they will take it on credit or give you just a few dollars off towards the purchase of a new HP Cartridge."
eHow Article: Recycling HP Printer Cartridges