Kosher all year around
Description: Sodium potassium tartrate (antioxidant)
Function: antioxidant
Rationale:
Sodium potassium tartrate (Rochelle salt) is made from the same fully-refined tartaric acid covered by the OU heter for cream of tartar, so the same all_year ruling applies.
If you don't see a status above, it does not mean the additive is not kosher automatically - it might just not be documented in our database yet.