Kosher all year around
Description: Potassium tartrates (i) Monopotassium tartrate (cream of tartar) (ii) Dipotassium tartrate (antioxidant)
Function: antioxidant
Rationale:
OU (Rav Belsky) ruling: modern multiply-refined cream of tartar/potassium bitartrate retains no trace of the non-kosher wine it was separated from, so it is kosher year-round (oukosher.org halacha yomis).
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.