We have added a chocolate taste to the glue of the stamps … which you can taste when you lick it,” the Belgian postal service said.
“The stamps are also imbued with the smell,” it said, while the design side carries pictures of chocolate in various forms.
“It was not easy to get the scent and flavour of the dark chocolate right. In the end, people from Belgium, Germany, the Netherlands and Switzerland all worked on it,” it said.
“It is not the first scented stamp … but this time it has been combined with a flavour.”
The series of five stamps, intended for overseas mail, will cost 6.20 euros ($A8.15) when they go on sale March 25.