sour salt

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Hello.  Has anybody used sour salt? or citric acid to improve upon the tanginess of loaves? 

I've been tempted once or twice, even have some in the cabinet but I end up playing with the process to develop the sourness naturally. So far, my best luck has been to extend ferment time in the refrigerator. My last two bakes I went 24 hrs. They had a good tangy flavor.