COLOR SAYBOLT COLOR: ASTM D156
(Equivalent Test Methods: DIN 51411, JIS K 2580, and AFNOR M07-003)
EXPLANATION
Saybolt Color - An empirical definition of the color of a clear petroleum liquid based on a scale of -16 (darkest) to +30 (lightest). The number is derived by finding the height of a column of the sample that, when viewed through the length of the column, visually matches the appropriate one of three glass standards.
This test method covers the determination of the color of refined oils such as undyed motor and aviation gasoline, jet propulsion fuels, naphthas and kerosene, and, in addition, petroleum waxes and pharmaceutical white oils. For determining the color of petroleum products darker than Saybolt Color -16, see Test Method ASTM D1500.
TEST SUMMARY
The height of a column of sample is decreased by levels corresponding to color numbers until the color of the sample is unmistakably lighter than that of the standard. The color number above this level is reported, regardless of whether the sample was darker, questionable, or a match at the higher level.
TEST PRECISION
Repeatability: 1 color unit
Reproducibility: 2 color unit
