prov:value
| - The oils may be refined by any suitable method, for example, using acid, alkali, and/or clay or other agents such, for example, as aluminum chloride, or they may be extracted oils produced, for example, by solvent extraction with solvents, for example, phenol, sulphur dioxide, furfural, dichlorodiethyl ether, nitrobenzene, or crotonaldehyde.
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