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Ink content of inkjet cartridges

I saw a discussion where everyone was complaining that "pages per cartridge" is a meaningless number. They wanted to know the actual ink content per cartridge to compare different options. OK, here's a start:

New CC643W cartridge weighs 35.8 grams
Used CC643W cartridge weighs 29.8 grams
So there's 6 grams of ink per CC643W cartridge (from HP).

Canon 3e black 53.1-21.4 = 31.7 gram ink per cartridge.

If you have similar data for other options, add them as a comment. Comments without actual data (promotional "fluff") will be deleted.

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