3202.90.10.00 - Consisting wholly of inorganic subtances

HTS code 3202.90.10.00 specifically classifies inorganic tanning substances that consist *wholly* of inorganic materials. This category encompasses a range of inorganic compounds used in the tanning process of hides and skins. Examples include certain chromium salts, aluminum salts, and titanium salts that have been prepared and are intended for use in leather manufacturing. The key defining characteristic is the complete absence of any organic components within the substance itself.

This classification is distinguished from its sibling category, 3202.90.50.00, "Other," by the strict requirement of being composed *entirely* of inorganic substances. The "Other" category would capture any tanning preparations that are not exclusively inorganic, or potentially those that are inorganic but do not fit more specific subheadings if they existed under "Other." Therefore, if a tanning preparation contains even a small percentage of organic matter, it would be classified elsewhere.

As this HTS code is a leaf node, there are no further subcategories. Classification within this specific subheading relies on confirming that the tanning substance is indeed inorganic in its entirety and intended for use in the tanning of hides and skins, aligning with the broader scope of Chapter 32, which deals with tanning or dyeing extracts and related products.