Printer ink. It's liquid gold.

The Mirror points out that the average cost of replacing the tablespoon of ink in a 17ml colour printer cartridge is US$53, making it sixteen times more expensive than vintage 1985 Dom Perignon.

Personally, a colour cartridge for my HP printer is around US$36 so I guess I should be glad that I'm,
* not using one of those photo printers,
* not living in a country with such inflated and taxed prices,
* in a market where bootleg inks drive the legit prices down.

How prices compare: The Most Expensive liquids.

Printer Ink
A typical three-colour cartridge with a capacity of 17ml will set you back £29.
PRICE: £1.70 per ml

Chanel No.5 perfume
At £64 per 100ml bottle, screen siren Marilyn Monroe once said it was the only thing she wore in bed.
PRICE: 64p per ml

Blood
The National Blood Service charges £111 for 475ml of blood to private and NHS hospitals, which use 9,000 bags a day. Ink is seven times dearer.
PRICE: 23p per ml

Remy Martin XO
At £115 for a 70cl bottle, it's one of the most expensive cognacs you can buy on the High Street.
PRICE: 16.4p per ml

Dom Perignon Champagne, 1985
This year has produced one of the labels best vintages at £78 a 750ml bottle.
PRICE: 10.4p per ml

Space shuttle fuel
When Nasa launches the Shuttle it uses 4.17m litres of fuel, costing £750,000. If it ran on ink, it could 1,000 times more.
PRICE: 0.018p per ml