The heading covers preparations whose essential character is the natural coloring matter itself. If the preparation is formulated primarily as a food additive with the colorant as a minor functional component, it may fall outside 3203 and into a food-preparation heading. The distinction rests on the product's principal function and composition; a binding ruling from CBP can resolve borderline cases.

Colorants intended for food use are subject to FDA review under the Federal Food, Drug, and Cosmetic Act, and some require specific certification or listing as approved color additives. Cosmetic colorants face similar FDA oversight. Importers should confirm the colorant's approval status before entry and work with a licensed customs broker familiar with FDA admissibility procedures.