LOL I need to be a chemist, Thanks bernardsmith, I know you know your stuff because you have explained and helped me before with other problems, the only thing is I am unable to afford these test kits, I can get a hydroponic PH test meter from amazon for £10, but in an overcrowded house where bottles of wine are stored outside in the shed, the log store, on top of the wardrobe and under the bed more equipment is just out of my reach (my youngest son does 12th century re-enactment and I have to accompany him and this takes loads of kit).
I make wine because it is cheeper than buying it, as my wife keeps pointing out to me when I buy basic stuff like yeast and sterilising tablets. From everything so far for four years now I have only had one bad demijohn, a few have been OK and most have been good and a few exceptional. I don't mind not knowing how things happen with the why's and the wherefores as long as they keep happening for the better.
You guys show me up for the skin of my teeth fella that I am, your knowledge will come in handy for me one day when I retire and my little one has grown up and doesn't need me, LOL Amazon sell stills LOL I can't wait (although the missus says they are illegal).