What is the real color of lube oil? What is this physical properties called?

before dyes are added it is colorless - transparent, all light passes through without being absorbed, reflected, or scattered.What is the real color of lube oil? What is this physical properties called?
Lube oil has no dyes added. It is a mixture of colours. Look at a thin layer of lube oil floating on water and the colours it reflects from different angles.


This colour property of the oil varies according to the oil's ';Refractive Index'; by which, together with the ';Viscosity Index';, governs the grade of the oil when blended.





(A short term in a Lube Oil Blending Plant during my Oil and Gas Training Programme).

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