I hate to be a dullard, but I'm a chemist, so I feel I have to be... Ferric sulphate isn't rust, rust is Iron oxide (if you're being picky, you can have Iron oxide hydroxides, and Iron Chlorides classed as rust too). Also, Irn Bru contains Ammonium Ferric Citrate, not ferric sulphate. Sorry!
Again, sorry! My inner keyboard-warrior seems to be able to cope with most things except false chemistry!
On another note, Prince Charles when in ireland, asked the master brewer in Guiness, did the drink come from the liffey, because of how black the water is
Anyone see Obama drinking Guinness in a pub somewhere? I was pleased with the fact that he actually paid for it! (Even if he did accompany it with a PR-friendly quote about the president always picking up his tab) Guinness Racing... please log in to view this image
Yes in a small village called moneygall in co offaly, midland ireland roughly, the glass was then destroyed by his crowd incase of DNA stealing