color of base oil
color can be used as an indicator of oil health in many cases it is a reliable field indicator. However, color alone cannot tell the whole story of the oil’s condition. Therefore it can be test by well-known international testing method .The color of lubricating oils can range from transparent to opaque. The color is based on the crude from which it is made, its viscosity, method and degree of treatment during refining, and the amount and types of additives included.Measuring color is based on a visual comparison of the amount of light transmitted through a defined depth of oil. This can be done with a predefined test method and instrumentation or a subjective view of the oil with reference to a color gauge. In either case, there may be a number of variables to monitor for quality results.
virgin base oil color is vary from 1-2 .