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Oil Weathering Test - Mackay Apparatus  
Oils behave very differently, as shown in the Studies pictured below.

Oil "A" is relatively unchanged after 48 hours of weathering. Oil "B" has formed tarballs and Oil "C" has virtually disappeared.

mackay apparatus
crude A at 1 hour

mackay apparatus
crude B at 1 hour
mackay apparatus
crude C at 1 hour
mackay apparatus
crude A at 48 hours
mackay apparatus
crude B at 48 hours
mackay apparatus
crude C at 48 hours