bunch of grapes
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More about potassium sorbate and Campden tablets

Campden tablets are mainly sodium metabisulphite, Na2S2O5, this chemical reacts with acid (such as wine or grape juice) to release sulphur dioxide, SO2, which is a common preservative, E220, in many food stuffs. E223 is sodium metabisulphite itself. Some campden tablets are potassium metabisulphite, E224.

Potassium sorbate is sold in most wine-making shops as "fermentation stopper" and is a very common preservative in food listed as E202.  It is the potassium salt of sorbic acid C6H8O2, E200, which is present in edible Rowan (sorbus aucuparia) berries.

These "E numbers" are also used in much commercial wine-making. Unfortunately, not all wine has its ingredients listed, but that's slowing changing. If you wish to make an "organic" home wine, I'm afraid that this is not the site for you.

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