Have just done my first gallon of wurzle's orange wine and am about to stop fermentation and rack into different demijohn,
how much potassium sorbate do I add with the camden tablet?
thanks, texteditor.

Half a teaspoonful to the gallon.

I normally just use a campden tab - haven`t had any problems so far - what does the potassium sorbate do?
Most of quick wines get drunk pretty quickly

When racking, most yeasties are already dead or dormant and are falling to the bottom of the jar. It only needs a few survivors and if there is any sugar left or if you add any more to back-sweeten a wine before bottling, those yeasties would multiply to give you a bottle fermentation. This could be desirable if you wanted a sparkling wine, in the same way that you would prime a beer to get a fizz. A campden will finish off most of those who are just sleeping. Sorbate will prevent any survivors from reproducing.

cheers Moley