Kosher all year around
Description: Chlorophylls and Chlorophyltrns: (i) Chlorophylls (ii) Chlorophyltrns (food colouring)
Function: food colouring
Rationale:
Chlorophyll is extracted from edible green plants (alfalfa, nettles, spinach, grass); OU's dedicated color-additive article and other kashrus sources do not flag it as derived from a non-kosher source (unlike carmine/gelatin/wine), so blanket not_kosher appears to be a data error.
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.