Fluoride coating film forming treatment liquid, and magnet fluoride coating film forming method

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A fluoride coating composition forms a coating of a rare earth fluoride and/or an alkaline earth metal fluoride on a surface of an article to be coated. The composition contains the rare earth fluoride and/or alkaline earth metal fluoride, and a medium mainly containing at least one alcohol. In the composition, the rare earth fluoride and/or alkaline earth metal fluoride is swollen by the medium, is gelatinous, and is dispersed in the medium.