My uncle started growing Black Spanish grapes last year. This year he has already harvested a bunch. He has pressed and strained into 1 gallon bags which are then frozen. There is only a little pulp left in the juice and we're thinking of making some wine. There's probably 14+ gallons of joice frozen thus far, with a bunch left to press. Is it ok to use the frozen wine/pulp for wine, or will it impart an off flavor?