"Color additive" means a substance that satisfies both of the following requirements:
The term "color additive" does not include any material that the department, by regulation, determines is used, or intended to be used, solely for a purpose or purposes other than coloring.
The term "color," as used in this section, includes black, white, and intermediate grays.
This section does not apply to any pesticide chemical, soil, or plant nutrient, or other agricultural chemical, solely because of its effect in aiding, retarding, or otherwise affecting, directly or indirectly, the growth or other natural physiological process of produce of the soil and thereby affecting its color, whether before or after harvest.
Ca. Health and Saf. Code § 109895