Could you elaborate on this a little further? Is sodium sulphate labelled when present in vinegar & what brands are free of it?

I am a stickler for purity when it comes to extraction ingredients & finding a food grade acid that is pure & free of preservatives & things like this is proving difficult. Even online shops i am weary of because they seem to know little about what may or may not be mixed into citric or ascorbic acid powder.

Take ball for instance. Their canning acids are available in chain stores but are not pure. Very weary of ordering from anywhere involving lab supply because I tend to be a little paranoid.

I know canning salt is free of iodide & anti-caking agents, there has to be a similar product when it comes to acids where additives cause problems & are left out.