I realize that when using sulfite that the recommended process is to sulfite fruit or puree, say to 50 ppm, let sit overnight (12 - 24 hrs) to dissipate the so2 and then add the fruit to primary or rack on top of it in secondary fermenter.
In this instance I pureed ripe plums (minus pits) when available and added sulfite to 50 ppm (.33 g pot meta per gallon of puree) to protect color, reduce wild yeast, and prevent browning, and then put it in gallon zip locks and immediately froze it for later use.
I'm wondering if upon thawing the puree if I need to open the bag tops and let the puree "breathe" for let's say 12 hrs, before fermenting, or if having frozen it for a few days that the so2 will already have dissipated.
The fruit puree will be added to actively fermenting saison in primary fermenters, so sacchromyces yeast tolerance of so2 is at the center of the question, and whether it dissipates during freezing so becomes a non-issue.
My hunch and general inclination is that I could thaw the full bags, open their zip tops for a few hours to let the puree breathe, and then add the puree to primary, but I wonder if the sulfite already dissipated during the few days in the freezer.
Thanks for any insight here.