properties of the adsorbed film, or both. For instance, -naphthol has very little beneficial effect while /3-naphthoI very greatly increases the lubricating power both at room temperature and at elevated temperatures. The inhibition of the decrease in "oiliness" on heating may be due to the action of the addition agents as negative catalysts in the oxidation of the oil; this hypothesis is supported by the fact that most of the substances that have beneficial effects are known to act as antioxygens.
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