IRN BRU RECIPE REVEALED

By Cara Sulieman

SCOTLAND’S best-kept secret has been revealed – Irn Bru really is made from girders.

The keep of the recipe, Robin Barr, has let it slip that there is 0.002 per cent of ammonium ferric citrate (AFC) in the national drink.

And ferric means iron – even if it is tiny quantities of the metal.

AFC is one of the 32 ingredients that Robin mixes together once a month to make the sweet fizzy drink.