Medium |
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| fatty acids, above C12 |
 |
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| ferrous salt, aqueous solution * |
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| formaldehyde, aqueous solution (Formaline) |
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| formic acid |
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 |
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 |
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| Freons, Frigens (CFC, BrCFC) |
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| fuel oil (light or heavy) |
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* Salts are:
nitrates, nitrites, sulphates, sulphides, chlorides, acetates, tartrates, cyanides, phosphates, oxalates, etc.
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