Oilfield Glossary
Oilfield Glossary
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sheen

1. n. [Drilling Fluids]
A luster, brightness or radiance. A sheen appears as a spectrum of colors and is commonly caused by a thin film on a surface that diffracts light. A film of diesel oil on water has a multicolored luster and is an indicator of an oil spill or oil slick.
See: sheen test