2821.10.00.40 - Other

This HTS category, 2821.10.00.40, encompasses iron oxides and hydroxides that function as synthetic pigments but do not fall under the specific color classifications of black, red, or yellow. These "other" synthetic pigments include a range of iron-based colorants used in various industrial applications. Examples might include synthetic iron oxide blues, greens, or browns, as well as mixed iron oxides and other shades not explicitly defined by a single primary color. The key determinant for inclusion here is that the material is a synthetic iron oxide or hydroxide intended for use as a pigment.

The distinction of this category from its siblings lies precisely in the absence of a primary black, red, or yellow hue. While 2821.10.00.10, 2821.10.00.20, and 2821.10.00.30 are reserved for distinct black, red, and yellow synthetic iron oxide pigments respectively, this subheading serves as a catch-all for all other synthetic iron oxide and hydroxide pigments. Therefore, a pigment that exhibits a mixed color, a tertiary color, or a shade that is not distinctly black, red, or yellow would be classified under this "Other" designation.

As this is a leaf node within the HTS classification system, there are no further subcategories branching from 2821.10.00.40. Classification at this level requires careful analysis of the specific color produced by the synthetic iron oxide or hydroxide pigment to ensure it is not more specifically classified under a preceding sibling category. The intended use as a pigment is crucial, distinguishing these materials from industrial iron oxides not intended for coloring purposes.