- Specific gravity determination: Different oils show different specific gravities. The variation from the normal value indicates a mixture of oils.
- Refractive index determination: Fats have definite angles of refractive index. Variation from normal value indicates a mixture of fats.
- Solidification point or setting point: Solidification point is more specific than melting point. It is the temperature at which the fat melts and sets to solid. Each fat has a unique solidification point.
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