The property of color of solvent varies in importance with the application for which it is intended,the amount of color that can be tolerated being dependent on the color characteristics of the material in which it is used.The solvents with little or no color are required in the paint,varnish,and lacquer solvents,or diluents commercially available on today’s market.For over a century,color has been measured by visual comparison of samples with various standard color solutions.[1-3] Although visual color measurements techniques are widely used,these techniques are highly subjective as standard solutions cannot mimic the complex combinations of hue,saturations,and brightness that we perceive as the color of water or organic solutions.Many researchers have switched to the spectrophotometric determination of color.For this method,the absorbance of light energy is measured at one or more wavelengths from within the near ultraviolet (UV) to visible range of the spectrum.The most frequently used wavelength is between 270 and 450 nm.Researchers convert sample absorbance values to color units with standard curves derived from spectrophotometric measurements of Pt-Co solutions.In this study,standard equation converting spectral absorbances to standard Pt units at different wavelengths will be provided.