The Joneses wrote:

> Citric acid might be cheaper and more readily available as Vitamin C tablets.
> But some are made from citrus fruits, so got to be careful?
> Edrena

Citric acid and *ascorbic acid AKA vit C* are not the same thing. I find
citric acid "stronger" on the tongue. I've also seen it for sale in
Chinatown shops.
I personally, although it isn't quite as tart, would give white, not
red, verjus a try. It is the juice of unripe wine grapes. I'm an addict!
blacksalt