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Prepared driers are mixtures used to accelerate the drying of certain paints or varnishes by facilitating the oxidation of the drying oil. These products usually consist of a chemical drier (lead borate, zinc naphthenate, zinc oleate, manganese dioxide, cobalt resinate, etc.) with a filler, e.g., gypsum (solid driers), or of the concentrated solutions of these substances in gum, wood or sulphate turpentine, white spirit, etc., (e.g., calcium naphthenate or cobalt naphthenate in white spirit) with or without drying oil (liquid or paste driers).
This heading does not cover :(a) Boiled or otherwise chemically modified oils of heading 15.18. (b) Separate chemically defined compounds (generally Chapter 28 or 29). (c) Resinates (heading 38.06).
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