The saybolt color test is a method of analyzing the color of petroleum-based fuels to determine their quality and composition. The test is also called the saybolt chromometer method.
According to the Missouri Department of Agriculture, the saybolt color test is often used to determine if a fuel contains contaminants or degraded during storage. The test involves placing a sample of fuel in a narrow tube. The color of the sample is compared to a series of color discs. If the color varies significantly from the standard color gradient, the product is considered unsuitable for use. The saybolt color test does not work with dyed fuels or dark fuels.