packet

They were asked to send packets of all products she had been using before the test to a laboratory in Salt Lake City.

Some of the most popular have seen users disposing of packets of Arla's Lurpak butter and pouring cartons of milk away, with one captioned: “Not in my house.”

"They go out to the pub and he has a pint of Coke and a packet of crisps and he can chat to his friends," Lindsey said.

Alongside packets from long-gone brands such as Tudor Crisps, he has limited edition mugs, a crisp advent calendar and a Walkers jacket.

Prof Varanasi has previously made headlines for developing similar coatings for the insides of toothpaste packets – so you can get every last bit of toothpaste out.