Harmonized System

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Section X > Chapter 49

Section VI > Chapter 29 > Heading 2932

Explanatory notes

… a characteristic aromatic odour; it turns yellow and then brown when exposed to air. Used in the purification of …

Section VI > Chapter 28 > Heading 2843

… Colloidal precious metals; inorganic or organic compounds of …

Explanatory notes

… Sub-Chapter VI MISCELLANEOUS 28.43 ‑ Colloidal precious metals; inorganic or organic compounds of … Colloidal silver occurs in small grains or flakes, bluish, brownish or greenish‑grey, with a metallic glint. It is used … METALS, WHETHER OR NOT CHEMICALLY DEFINED These are : (I) Oxides, peroxides and hydroxides of precious metals , …

Section XI > Chapter 58 > Heading 5804

Section VI > Chapter 28 > Heading 2827

Section VI > Chapter 28 > Heading 2841

Explanatory notes

… and peroxometallic acids (corresponding to metal oxides which constitute anhydrides). The main groups of … . Prepared from bauxite, barytes and coal; white or brown masses. Used for purifying industrial water and as an … 4 ), prepared from manganous oxide and chromic anhydride. Brownish crystals, soluble in water. Used as a mordant in …