Coating Terms

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Grieves’ “drying index” is widely accepted to define drying oils:

Drying index=(Percentage of fatty acids with 2 double bonds)+2*(Percentage of fatty acids with 3 double bonds)

Oils having a drying index greater than 70 are classified as drying oils. Grieves’ formula cannot be applied to oils containing conjugate unsaturated fatty acids. “Iodine value” is also utilized to identify drying tendency.