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A chemical treatment added to cut wood products to minimize insect and fungal infestations. Wood preservatives are typically applied by spraying, brushing, immersion or pressure treatments. Some of these biocide materials may be toxic to humans. Examples are tar oils (creosote, Anthracene oil, chlorinated naphthalenes), Copper naphthenate, Zinc naphthenate, borates, Sodium fluoride, Copper chromated arsenate, and formerly, Mercuric chloride.