Ink for home printers is now seven times more expensive than vintage champagne.
Ink in a typical replacement cartridge costs about £1.70 per millilitre, compared with 1985 Dom Perignon at 23p per millilitre.
The news comes as a Which? survey shows that many cartridges say they are empty long before they are. Some printers warn users that the ink is about to run out.
Ignoring the warnings can nearly double the printing output.
