The price for HP ink cartridges isn't shrinking but the amount of ink that HP puts into those cartridges sure has, according to an investigation by HP Ink Cartridges.co.uk.

The site took two of the same model of ink cartridges, the HP 350. One was produced in 2010, the other in 2012. They sawed off the top and measured the spot that holds the ink with a sponge. The one from 2012 held about half the ink from 2010. But from the outside they looked the same.

The site then looked at the brand new HP HP 301. It held even less ink than the 350 cartridge made in 2012.

Pay the same. Get less ink. That's one crummy way for HP to save its printer business.

Take a look: