A blown oil is a drying oil which has been modified through an oxidative process.
Oils are "blown" through partial oxidation of the oil at elevated temperatures.
A typical blowing process involves heating the oil to 70 to 120 °C (158 to 248 °F) and passing air through the liquid.
[1] The modification causes the formation of C-O-C and C-C cross links, and hydroxyl and carboxyl functional groups.
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