13.8.3   Contamination by fats/oils
Fats and oils are staining substances which penetrate into the surface or upper layers of goods and cause sometimes irreversible stains or saturate the entire article. Oil degrades any cargo with which it comes into contact; even leather, lumber and marble may become completely worthless. Oil-impregnated fibers (esparto grass, hemp) and fibrous materials (cotton, cleaning rags) give rise to self-heating and spontaneous combustion.
In practice, contamination by dust, dirt and fats/oils may occur in virtually any combination with both active and passive behavior.

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