Copper Vitriol Blue Crystals from Mexico
Traditional name for hydrated copper sulfate pentahydrate, used in pigments and dyes. Classified under 2833.25.00.00 as sulfate of copper; historical vitriol but modern chemical definition applies. Deep blue color from Cu2+ ions.
Duty Rate — Mexico → United States
1.4%
Rate breakdown
9903.05.860%Articles provided for in subdivision (b) of U.S. note 52 to this subchapter
Import Tips
• Disclose traditional names on invoice alongside chemical formula to prevent confusion
• Test for arsenic impurities common in natural vitriol sources
• Label with GHS hazard pictograms for skin/eye irritant and aquatic toxicity