What makes you think you saw on the grapes was spray?
Tim
> I encountered an H2S problem when I made wine from chardonnay grapes that
> were sprayed with sulfur. The sulfur residue could be seen on the grapes.
> Of course the H2S may have been caused by some other reason and the problem
> was resolved by aeration.
>
> I wonder how a spray program of sulfur and copper could affect winemaking.
> Does residual amounts of sulfur on grapes contribute to free SO2 and H2S in
> wine?
> What effects does residual amounts of copper have on wine?
> thanks
> Sarge