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.^[1]

Blown oils are chemically different from oils modified only by heating,^[1] which are known as stand oils.^[2]

Some common types of oils that can be blown include linseed oil, rapeseed oil, castor oil and soybean oil.

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