Grape juice issues..

[noswald]

Hello. I just bought 6 gals of pinot grigio juice from a California vineyard. It came refrigerated. I left it set in the original pkg till up to room temp. When I opened it, it looked top me to be fermenting already. it was for lack of better terms, boiling and very effervescent. I also bought 6 gals of cab and the juice was still when opened. Could the white have been infected?

 

[Boatboy24]

Probably just started fermenting. I'd hit both with ~50ppm of SO2 and wait 24 hours. Then pitch your yeast.

 

[TonyR]

Some juice buckets come with yeast all ready added. Ask the supplier.

 

[BiffTannins]

If it is a Regina juice bucket, it will have yeast already added to it.

 

[pete1325]

Whether it's natural yeast or pre-added yeast shouldn't you first add K-Meta (to stop any fermentation), wait 24 hours then pitch yeast?

 

[cmason1957]

Whether it's natural yeast or pre-added yeast shouldn't you first add K-Meta (to stop any fermentation), wait 24 hours then pitch yeast?

K-Meta might stop wild yeast from fermenting, but commercial yeast will just be slowed down a bit by it.