It’s enough that printer ink might be the most expensive liquid you buy. Even the cheapest ink in replacement cartridges—at about $13 an ounce—costs more than twice as much as Dom Pérignon Champagne*, while the priciest—closer to $95 an ounce—makes gasoline seem like a bargain.

It’s still far less painful than $12,160 per gallon, right?

But our lab tests show that much of that precious ink never makes it onto the printed page. Instead, it’s used for cleaning print heads and other maintenance chores, typically when the printer is starting up after sitting idle for awhile.

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