Kosher, except for Pesach
Description: Ferrous gluconate (food colouring)
Function: food colouring
Rationale:
Same gluconic-acid/corn-fermentation origin as E578, so the same kitniyot-for-Passover concern 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.