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 Ah. It's for consistency. Wounder if it also gives taste.
Says it has a slightly acidic smell.
No, buns do not taste of lemon. 
 Ah. To extend shelf life of breads.
So... this is what they use in bread to bread it last...
You know, when you bake your own bread, it usually lasts for 2-3 days before it starts getting "hard". No longer has that softness as when when fresh.
Hmm...