Jarvis Morrison Sweeney, 11, couldn't believe his eyes when he cracked open the can of Irn Bru sugar free to find it was clear, but the youngster said it still tasted like Scotland's national soft drink, which is famous for its iconic bright orange colour.
Jarvis, from Dunfermline, Fife, rushed to tell his mum, Alana Morrison, 48, about the clear liquid after opening the can on Sunday October 11.
Irn Bru manufacturer A.G. Barr described the rare can as 'one in a million'.
Jarvis said: "I just poured it into the glass and was like 'that's not normal'. It looked like fizzy water but I wanted to see what it tasted like.
"It was completely clear, not even a tinge of orange."
Mum-of-two Alana, who runs a hotel, said: "We've got the hotel and we bought a case of sugar free for the bar.
"I'd taken two tins out the case on Saturday and we shared one, then he opened the next tin on Sunday.
"Low and behold it came out clear. He poured it into a glass and my brother tasted it first.
"It was completely colourless, like sparkling water. We had a laugh about it because we grew up hearing Irn Bru was brewed by girders and the colour comes from the rust.
"What else could go wrong in 2020. They've taken away our freedom and now they've taken the colour out of our Irn Bru."
A.G. Barr has been approached for comment.
A version of this article first appeared on The Scotsman.