> I'm guessing that whatever acid they used to imitate the vinegar 
> flavoring was a bit much for our intrepid mascot.
> 
>> What are the ingredients? Sounds like you had an allergic reaction to 
>> one of the many chemicals they use to produce the illusion that the 
>> chips are actually food.

In the interests of science, the ingredients:

- Potato
- Sunflower oil (28%)
- Rice flour
- Flavouring:
   - Sodium diacetate
   - Citric acid
   - Maltodextrin
   - Yeast extract
   - Malic acid
   - Vegetable oil
   - "Flavouring"
   - Potato starch
- Maize flour
- Potassium chloride
- Salt
- "Flavouring"

OK, so it contains at least 28% potato - which is reassuring. Not sure 
why the rice flour and maize flour are in there. (Perhaps for reasons of 
texture.) Presumably they use KCl in addition to NaCl so they can claim 
"low in sodium".

Check this out:

http://en.wikipedia.org/wiki/Malic_acid

That looks like the puppy then.

Since vinegar is essentially nearly-pure acetic acid, I wonder why they 
don't just take potatos and put a little acetic acid and salt on them. 
That would seem simpler and hence cheaper. But whatever.

Oh, Wikipedia claims that sodium diacetate is actually a 50/50 mixture 
of sodium acetate and acetic acid:

http://en.wikipedia.org/wiki/Sodium_diacetate

That'll be it then. The acetic acid gives it a flavour, and the sodium 
acetate is a buffering agent.

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