Posted: 26/08/2012 at 19:14
Dean - I have no idea, I've seen it listed at the allotment shop for sale though, not that I have any intention of using it.
Becks - Bordeaux Mix is a copper based solution which you can spray on tatties or tommies, it's supposed to form a barrier on the leaves so that air born blight spores can't infect the plant. It's called Bordeaux Mix because it was first used on vines in vinyards in the Bordeaux region of France.
Just checked the BBQ, not sure what the black things started out as.